粮食和油料输送链制造商及供应商

粮食和石油产业链制造商

Grain and oil industrial chains are specially designed for the entire grain and oil production process, suitable for core links such as raw material transshipment, oilseed pressing, deep processing, finished product warehousing and transshipment. Adopting special materials resistant to oil, dust and wear, through special heat treatment and surface protection processes, they can withstand the harsh working conditions of high dust, oil infiltration, light and medium load and continuous operation in grain and oil workshops. As a grain and oil industrial chain manufacturer, we accurately match the operation needs of grain and oil equipment, optimize the chain structure design, ensure stable transportation, wear resistance and durability, effectively reduce equipment failure rate, improve grain and oil production efficiency, and provide efficient and reliable conveying chain solutions for the grain and oil industry.

Grain and Oil Industrial Chain Overview

Oil and Dust Resistant

Adopt oil-resistant alloy steel or stainless steel materials, combined with surface anti-adhesion treatment, to resist oil infiltration and dust accumulation in grain and oil workshops, and avoid chain jamming and slipping caused by material adhesion.

高耐磨性和重载能力

Strengthen heat treatment process to improve the hardness of key components (pins, sleeves), adapt to the demand of continuous operation under light and medium load in grain and oil production, reduce chain wear and equipment maintenance frequency, and extend service life.

Stable Operation and Strong Adaptability

Optimize the structure of chain links and chain plates, reduce jamming and deviation, match the high-speed continuous operation needs of grain and oil production lines, ensure stable transportation of materials (granules, powder, finished product packaging), and avoid material spilling and damage.

Various Customization Options

材料（耐油合金钢、食品级 304/316 不锈钢等）、节距、链板厚度、链条长度和表面处理（抛光、钝化、镀镍）均可根据需求定制，以适应不同型号的粮食和油脂设备（压榨机、分拣机、输送机）的工作条件。

全过程质量控制

From raw material procurement, production and processing to finished product delivery, we strictly follow the ISO9001 quality management system, with full traceability. Each batch of products provides professional test reports on oil resistance, wear resistance, load capacity, etc., to ensure that the products meet the strict standards of the grain and oil industry and food hygiene requirements.

Application Scenarios

原材料转运环节

用于小麦、大米、大豆、油菜籽等粮食和油料原料的散装转运，适用于原料采购后的装卸以及临时仓储区域的运输等场景。该链条防尘性能优异，能够承受原料颗粒的摩擦和冲击，避免因灰尘积聚造成的堵塞，确保原料转运的连续高效进行。

Oilseed Pressing Link

Suitable for feeding of presses, oilseed pretreatment and transshipment of residues after pressing. The chain is resistant to oil erosion and wear, can withstand light and medium load impact during the pressing process, avoid component adhesion caused by oil adhesion, and ensure smooth pressing process.

深度处理链接

Used for sorting, screening and transportation of deep-processed products such as flour and rice. The chain has a smooth surface and no hygiene dead corners, which can avoid scratching materials and residual impurities, adapt to the transportation needs of deep-processed products of different specifications, and improve deep processing efficiency.

Finished Product Warehousing and Transshipment

Used for transportation, stacking, warehousing inbound and outbound of finished grain and oil such as packaged oil and bagged rice/flour. The chain runs stably with uniform load-bearing, which can avoid damage and slipping of finished products, and is also suitable for long-distance transshipment in the warehousing link to ensure the safety of finished product storage and transshipment.

By-Product Processing Link

Used for transportation and sorting of by-products such as bran and soybean meal after oilseed pressing. The chain is wear-resistant and impact-resistant, can withstand the friction and load of by-products, avoid rapid chain loss, and adapt to the continuous operation needs of the by-product recycling production line.

全系列规格

以下列出了粮食和石油工业链条的常用规格。如有需要，我们可提供定制尺寸和非标选项。请联系我们了解更多详情。

Chain No.	Pitch	Narrow end		Bush diameter	Sidebar		Pin		Tensile strength	Rated working load
	P	b₁(min)	b₂ (max)	D	h	T	d₁	L	Fu(min)	Rated working load
	mm	mm	mm	mm	mm	mm	mm	mm	kN	kN
WR78	66.27	28.6	50.8	22.23	28.4	6.4	12.7	77	106.8	18
WH78	66.27	28.6	50.8	22.23	28.4	6.4	12.7	77	160	27
WR78A	66.27	28.6	50.8	21.4	31.8	6.4	12.7	77	106.8	18
WH78A	66.27	28.6	50.8	21.4	31.8	6.4	12.7	77	160	27
WR82	78.1	31.8	57.7	27	31.8	6.4	14.27	86	133.4	22
WH82	78.1	31.8	57.7	27	31.8	6.4	14.27	86	177.8	30
WH82A	78.1	31.8	57.7	31	31.8	6.4	14.27	86	177.8	30

* chain plate is not heat treated

# chains have all parts heat treated

Chain No.	Pitch	Narrow end		Bush diameter	Sidebar		Pin		Tensile strength	Rated working load
	P	b₁ (min)	b₂ (max)	D	h	T	d₁	L	Fu(min)
	mm	mm	mm	mm	mm	mm	mm	mm	kN	kN
WHX124	101.6	41.4	72.0	31.75	38.1	9.5	19.05	108	266	44
WHX124A	101.6	41.4	72.0	36.57	38.1	9.5	19.05	108	266	44
WHX111	120.9	50.8	85.7	31.75	44.5	9.5	19.05	124	266	44
WHX106	152.4	41.4	72.0	31.75	38.1	9.5	19.05	108	266	44
WHX106A	152.4	41.4	72.0	34.9	38.1	9.5	19.05	108	266	44
WHX132	153.67	76.2	111.6	44.45	50.8	12.7	25.4	160	378	63
WHX150	153.67	76.2	111.6	44.45	63.5	12.7	25.4	160	580	97
WHX155	153.67	70	111.3	44.45	63.5	14.3	28.52	164	650	108
WHX157	153.67	75.7	117.3	44.45	63.5	15.9	28.52	173	660	110
WHX159	155.57	73.2	118.1	50.8	76.2	15.9	31.75	173	908	151

^ chains have all parts heat treated and pin surface induction hardened

链号	H	T	F₁	F₂	W	d4	B
链号	毫米	毫米	毫米	毫米	毫米	毫米	毫米
WH78	28.4	8	115	195	235	10	16
WH82	31.8	8	120	210	250	10	18
WHX124	38.1	10	150	250	290	12	25
WHX111	44.5	10	170	270	320	12	25
WHX106	38.1	10	175	295	340	12	30
WHX132	50.8	12	200	340	390	14	30
WHX150	63.5	14	200	360	420	14	32
WHX155	63.5	14	220	420	480	14	35
WHX157	63.5	16	220	440	500	14	35
WHX159	76.2	16	225	465	540	16	38

以上数据仅供参考，实际尺寸由最终用户指定。

链号	H	T	F₁	F₂	F₃	W	d4	B
链号	毫米	毫米	毫米	毫米	毫米	毫米	毫米	毫米
WH78	28.4	8	110	220	330	360	10	16
WH82	31.8	8	125	245	365	415	10	18
WH124	38.1	10	150	300	450	500	12	25
WH111	44.5	10	170	330	490	540	12	25
WH106	38.1	10	185	365	545	600	12	30
WH132	50.8	12	200	380	560	620	14	30
WH150	63.5	14	200	400	600	660	14	32
WH155	63.5	14	210	410	610	680	14	35
WH157	63.5	16	225	445	665	725	14	35
WH159	76.2	16	240	480	720	780	16	38

以上数据仅供参考，实际尺寸由最终用户指定。

Chain No.	H	T	F₁	F₂	W	d4	B	α
Chain No.	mm	mm	mm	mm	mm	mm	mm
WH78	28.4	8	115	205	245	10	15	60
WH82	31.8	8	120	210	250	10	15	60
WH124	38.1	10	150	230	270	12	25	60
WH111	44.5	10	170	270	320	12	25	60
WH106	38.1	10	175	295	340	12	28	60
WH132	50.8	12	200	300	350	14	28	60
WH150	63.5	14	200	310	360	14	30	60
WH155	63.5	14	210	330	380	14	30	60
WH157	63.5	16	220	340	400	14	32	60
WH159	76.2	16	225	355	415	16	35	60

The above data is for reference only, and the actual size is specified by the end user.

Chain No.	H	T	F₁	F₂	F₃	W	d4	B	α
Chain No.	mm	mm	mm	mm	mm	mm	mm	mm
WH78	28.4	8	110	220	330	350	10	15	60
WH82	31.8	8	125	245	365	415	10	15	60
WH124	38.1	10	150	300	450	500	12	25	60
WH111	44.5	10	170	330	490	540	12	25	60
WH106	38.1	10	185	365	545	600	12	28	60
WH132	50.8	12	200	380	560	620	14	28	60
WH150	63.5	14	200	400	600	660	14	30	60
WH155	63.5	14	210	410	610	680	14	30	60
WH157	63.5	16	225	445	665	725	14	32	60
WH159	76.2	16	240	480	720	780	16	35	60

The above data is for reference only, and the actual size is specified by the end user.

链号	E₁	E₂	T	F₁	F₂	W	d₄	B
链号	毫米	毫米	毫米	毫米	毫米	毫米	毫米	毫米
WH124	38	38	6	150	230	270	12	25
WH111	45	45	6	170	270	320	12	25
WH106	38	38	8	175	295	340	12	30
WH132	50	50	8	200	300	350	14	30
WH150	63	63	8	200	310	360	14	32
WH155	63	63	10	210	330	380	14	32
WH157	63	63	12	220	340	400	14	35
WH159	75	75	12	225	355	415	16	35

以上数据仅供参考，实际尺寸由最终用户指定。

Chain No.	E₁	E₂	T	F₁	F₂	F₃	w	d₄	B
Chain No.	mm	mm	mm	mm	mm	mm	mm	mm	mm
WH124	38	38	6	150	230	310	350	12	25
WH111	45	45	6	170	270	370	410	12	25
WH106	38	38	8	175	295	415	460	12	30
WH132	50	50	8	200	300	400	450	14	30
WH150	63	63	8	200	310	420	470	14	32
WH155	63	63	10	210	330	450	500	14	32
WH157	63	63	12	220	340	460	510	14	35
WH159	75	75	12	225	355	485	540	16	35

The above data is for reference only, and the actual size is specified by the end user.

Chain No.	T	F₁	F₂	W	d₄	B	α
Chain No.	mm	mm	mm	mm	mm	mm	α
WHX124	6	155	235	275	10	25	60
WHX111	6	180	280	330	10	25	60
WHX106	6	170	290	340	10	30	60
WHX132	10	230	350	400	12	30	60
WHX150	10	230	340	380	12	32	60
WHX155	10	240	360	410	12	32	60
WHX157	10	240	400	450	14	35	60
WHX159	12	245	445	500	14	35	60

The above data is forreference only,and the actual size is specified by the end user.

Chain No.	T	F₁	F₂	F₃	W	d₄	B	α
Chain No.	mm	mm	mm	mm	mm	mm	mm	α
WHX124	6	155	235	315	355	10	25	60
WHX111	6	180	280	380	430	10	25	60
WHX106	6	170	290	410	450	10	30	60
WHX132	10	230	350	470	530	12	30	60
WHX150	10	230	360	490	550	12	32	60
WHX155	10	240	440	640	690	12	32	60
WHX157	10	250	470	690	750	14	35	60
WHX159	12	255	495	735	800	14	35	60

Chain No.	P	T	H	S	F	E	d₁	L	Ultimate tensile strength
Chain No.	mm	mm	mm	mm	mm	mm	mm	mm	Ultimate tensile strength
125×30×36	125	30	36	13	14	10	16	44	200
142×30×40	142	30	40	13	14	9	18	46	180
142×42×50	142	42	50	19	20	12	25	65	300
142×44×50	142	44	50	19	20	13	25	65	320
142×54×50	142	54	50	25	27	16	25	82	420
142×56×50	142	56	50	25	26	17	25	84	450
142×62×50	142	62	50	28	30	15	25	86	500
160×46×46	160	46	46	22	24	15	22	62	320
160×50×53	160	50	53	23	25	13	25	68	370
200×60×50	200	60	50	25	27	13	25	84	380
200×66×60	200	66	60	30	32	20	30	90	500

Chain No.	H	T	B	W
Chain No.	mm	mm	mm	mm
125×30×36	36	10	25	200
142×30×40	40	10	30	220
142×42×50	50	12	37	300
142×56×50	50	16	41	480
160×50×53	53	16	41	500

链号	H	T	B	W	α
	毫米	毫米	毫米	毫米
125×30×36	36	10	25	200	85
142×30×40	40	10	30	220	85
142×42×50	50	12	37	300	85
142×56×50	50	16	41	480	85
160×50×53	53	16	41	500	85

链号	H	T	B	W	G
链号	毫米	毫米	毫米	毫米	毫米
142×42×50	100	16	25	340	200
142×56×50	120	16	25	450	300

Chain No.	H	T	B	W
Chain No.	mm	mm	mm	mm
20×50	50	20	25	390

Chain No.	Pitch							Width between sidebars	Bush	Pin		Plate		Roller				Ultimate tensile strength
	P							b₁	d₂	d₁	L	h	t/T	S	R	F		Fu(min)
	P							b₁	d₂	d₁	L	h	t/T	d₃	d4	d5	b₂	Fu(min)
	mm							mm							mm	mm	mm	kN
M20	40	50	63	80	100	125	160	16	9	6	35	19	2.5	12.5	25	25	3.5	20
M28	50	63	80	100	125	160	200	18	10	7	40	21	3	15	30	30	4	28
M40	63	80	100	125	160	200	250	20	12.5	8.5	45	26	3.5	18	36	36	4.5	40
M56	63	80	100	125	160	200	250	24	15	10	52	31	4	21	42	42	5	56
M80	80	100	125	160	200	250	315	28	18	12	62	36	5	25	50	50	6	80
M112	80	100	125	160	200	250	315	32	21	15	73	41	6	30	60	60	7	112
M160	100	125	160	200	250	315	400	37	25	18	85	51	7	36	70	70	8.5	160
M224	125	160	200	250	315	400	500	43	30	21	98	62	8	42	85	85	10	224
M315	160	200	250	315	400	500	630	48	36	25	112	72	10	50	100	100	12	315
M450	200	250	315	400	500	630	800	56	42	30	135	82	12	60	120	120	14	450
M630	250	315	400	500	630	800	1000	65	50	36	154	103	16	70	140	140	16	630
M900	250	315	400	500	630	800	1000	76	60	44	180	123	18	85	170	170	18	900

链号	H	T	F₁	F₂	W	d₄
链号	毫米	毫米	毫米	毫米	毫米	毫米
M80	36	6	100	180	210	7
M112	41	6	120	200	230	7
M160	51	8	140	240	280	7
M224	62	8	180	320	360	8
M315	72	10	200	400	450	12

链号	B	F₁	F₂	W	d₄
链号	毫米	毫米	毫米	毫米	毫米
M80	25	100	180	210	7
M112	30	120	200	230	7
M160	35	140	240	280	7
M224	35	180	320	360	8
M315	40	200	400	450	12

Chain No.	Pitch						Width between sidebars	Bush	Pin		Plate		Roller					UItimate tensile strength
	P						b₁	d₂	d₁	L	h	t/T	S	R	F			Fu(min)
	P						b₁	d₂	d₁	L	h	t/T	d₃	d₄	d₅	d₆	b₂	Fu(min)
	mm						mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	mm	kN
FV40	40	63	100	一	一	一	18	15	10	37	26	3	20	32	40	48	5.5	40
FV63	63	100	125	160	一	一	22	18	12	46	30	4	26	40	50	60	6.5	63
FV90	63	100	125	160	200	250	25	20	14	53	35	5	30	48	63	73	7.5	90
FV112	100	125	160	200	250	一	30	22	16	63	40	6	32	55	72	87	9.5	112
FV140	100	125	160	200	250	315	35	26	18	68	45	6	36	60	80	95	11	140
FV180	125	160	200	250	315	400	45	30	20	86	50	8	42	70	100	120	12	180
FV250	125	160	200	250	315	400	55	36	26	98	60	8	50	80	125	145	15.5	250
FV315	160	200	250	315	400	一	65	42	30	117	70	10	60	90	140	170	17.5	315
FV400	160	200	250	315	400	一	70	44	32	131	70	12	60	100	150	185	17.5	400
FV500	160	200	250	315	400	500	80	50	36	141	80	12	70	110	160	195	21.5	500
FV630	200	250	315	400	500	一	90	56	42	153	100	12	80	120	170	210	26.5	630

Chain No.	H	T	F₁	F₂	W	d₄
Chain No.	mm	mm	mm	mm	mm	mm
FV90	35	5	110	190	220	7
FV112	40	6	120	190	230	7
FV140	45	6	140	240	280	7
FV180	50	8	190	290	320	9
FV250	60	8	200	400	450	12

Chain No.	B	F₁	F₂	W	d₄
Chain No.	mm	mm	mm	mm	mm
FV90	25	100	180	210	7
FV112	35	120	200	230	7
FV140	35	140	240	280	7
FV180	45	180	320	360	8
FV250	45	200	400	450	12

Customized Services

需要超越标准型号的产品？我们提供全套定制解决方案——从导轨和材料到附件和间距——专为您的应用而设计。所有尺寸均可定制。如有特殊要求，请联系我们。

Customization Item	Available Options	Description
Material of Core Components (Link Plates, Pins, Bushings, Rollers)	Stainless Steel (304/316L), 904L, 2205/2207 Duplex Steel	Improve corrosion resistance and extend service life
Guide Rails & Sliding Plates	Customizable Polymer Material UHMW-PE, Hardox HiAce Special Steel	Enhance wear resistance and corrosion resistance
Structure & Accessories	Customizable Reinforced Link Plates, Various Shapes of Large/Small Accessories	High strength, meet the requirements of functional attachment plates
Dimensions	Almost all geometric dimensions are customizable	To adapt to different paper machine widths and layouts
Precision	Customizable high-precision assembled components	Easy disassembly, assembly and maintenance
Special Performance	High-temperature resistance, corrosion resistance, wear-resistant design	To meet different operating environments and requirements

质量检测设备

At Matech, we have a complete production base specially built for grain and oil industrial chains, equipped with advanced and precision chain manufacturing equipment, covering the entire production links such as CNC stamping, special heat treatment, and automatic assembly lines. Each process is strictly controlled to ensure the stability of product performance and quality, meeting the strict requirements of continuous production in the grain and oil industry.

The complete quality inspection system is equipped with hardness testers, tensile testing machines and high-precision dimensional measuring instruments to comprehensively test the core performance of grain and oil chains such as oil resistance, wear resistance, load capacity and hygiene indicators, ensuring that each chain is strictly verified before leaving the factory. The perfect combination of cutting-edge production equipment and strict quality control demonstrates our comprehensive strength as a reliable manufacturer of grain and oil industrial chains, providing high-quality and highly adaptable conveying components for grain and oil enterprises.

常见问题解答

与一般产业链相比，粮食和石油产业链有哪些独特的优势？

与普通产业链相比，它们的行业特定优势体现在以下三个方面：
①防尘堵塞，适用于面粉、麸皮等粉尘较多的工作环境，采用优化的链板结构，不易积聚粉尘和卡住；
② 耐油蚀，能够承受冲压车间中的油渗，不易造成部件生锈和粘附；
③适用于轻载和中载连续运行，满足粮食和油脂生产24小时不间断工作条件，磨损率低，使用寿命长。
Matech 的粮食和油脂工业链可以根据粮食和油脂生产线工位（如压榨、仓储、深加工）的特点定制节距和链板厚度，以适应不同物料（颗粒、粉末、成品包装）的运输需求。

粮食和石油产业链的共同原材料有哪些？

Combined with the differences in working conditions of grain and oil production, common materials are mainly divided into three categories:
1. High-quality carbon steel material, suitable for conventional stations in grain and oil production without oil infiltration and less dust, such as bulk grain transshipment and outdoor warehousing transshipment of finished grain and oil, with high cost performance and able to meet the needs of conventional light and medium loads;
2. Manganese steel material, suitable for stations with slightly larger loads and slight oil infiltration such as oilseed pressing workshops and bran transshipment, with high hardness and wear resistance, which can avoid chain plate deformation caused by long-term heavy loads;
3. 304/316 stainless steel material, suitable for stations with food contact or high cleaning requirements such as flour deep processing, finished grain and oil transportation, and edible vegetable oil pressing, with no impurity residue, easy to clean, and in line with the hygiene standards of the grain and oil industry. Key components such as chain pins and sleeves are all processed with seamless pipes, which have higher dimensional accuracy than seamed pipes, and can avoid deformation and wear caused by long-term contact with oil and load operation. Matech can provide customized material solutions according to the oil content and dust concentration of specific stations.

Grain and oil production is related to food safety. How does your company ensure the quality stability of industrial chains, and can you provide authoritative material certificates and test reports?

我们以“食品安全为核心”，建立了全流程质量控制体系，严格执行ISO9001质量管理体系和粮油行业专用标准，确保供应链质量稳定，并适应生产需求。具体保障措施包括：一、原材料管控，所有原材料均经过严格筛选，碳钢、不锈钢等原材料均提供原厂材料证书，防止不合格原材料入厂；二、全流程检测，从原材料入厂到成品交付，需经过化学成分分析、硬度测试、尺寸精度测试、极限抗拉强度测试、耐油腐蚀测试、防尘堵塞测试等6项专项检测，精准适应粮油行业的作业特点；三、权威认证，每批产品均可提供符合ANSI、ISO等国际标准以及国内粮油行业输送运输标准的正式材料证书和检测报告，可直接用于客户卫生验收和质量审核。同时，可根据客户需求安排SGS、BV等第三方权威机构进行检测。Matech对每批产品负责，确保整个供应链无质量隐患，满足粮油生产线连续稳定运行的要求。

大多数粮食和油脂生产线都是连续运转的。链条安装和维护不当很容易影响生产。具体应该采取哪些预防措施？

Combined with the needs of "continuity and low failure" in grain and oil production, 4 key points should be focused on during installation and maintenance to avoid chain failures and production impact caused by improper operation:
1. Installation alignment: Ensure that the sprocket and chain are accurately coaxial aligned with a deviation not exceeding 0.5mm to avoid eccentric load, especially for continuous conveying stations such as flour and oilseeds, to prevent jamming and slipping caused by deviation and affect production continuity; before initial use, it is necessary to carry out no-load running-in for 2-4 hours to check for transmission hidden dangers.
2. Lubrication and maintenance: Select special lubricating oil according to the working conditions of the station - anti-dust high-viscosity chain oil is used for stations with high dust (such as flour workshops), and oil-resistant lubricating oil is used for oil-soaked stations (such as pressing workshops) to avoid reaction between lubricating oil and grain and oil materials and dust adhesion to the chain; check and supplement every 80 hours for stations with high dust, and every 120 hours for conventional stations to eliminate dry wear.
3. Tension adjustment: Maintain a reasonable tension, and the chain sag should be controlled at 2%-4% of the center distance. Too loose is easy to jump and derail, and too tight will aggravate component wear and increase equipment power consumption. Long-distance conveying lines need to be checked and adjusted once a week.
4. Regular inspection: Every 500 hours of operation, check the chain elongation, chain plate wear, and pin looseness. When the elongation exceeds 3%, the chain must be replaced in time to avoid failures such as chain breakage and jamming, and ensure the continuous operation of the production line; if severe chain plate wear or loose pins are found, the components must be repaired or replaced in time to prevent the failure from expanding and affecting production efficiency.

How to select the appropriate chain series according to the working conditions of the grain and oil production line?

结合粮油生产站的特点和运输需求，链式运输系统围绕“运输方向、装载量和工作环境”三个核心维度进行选择。具体适配方案如下：
1. ZC系列（英标）：适用于粮油行业的一般运输工况，符合BS标准，主打常规轻中载匀速传动，适用于散装粮食原料转运、成品粮油包装后运输、仓储出入库等一般工况。该系列性价比高，是粮油行业应用最广泛的基础系列。
2. FVC系列（德国标准）：采用弯板结构设计，运行灵活，转弯平稳，适用于粮食和油脂生产线的转弯运输站，如面粉分拣弯道、成品粮食和油脂转运拐角、仓库拐角运输等，可有效避免转弯过程中链条卡住和物料滞留。
3. MC系列（德国标准）：采用直板结构，承载能力强，传动稳定性高，适用于粮食和油脂生产线的长距离直线输送站，如粮食原料的长距离转运、油籽压榨车间的直线物料输送以及成品粮食和油脂装配线的长距离输送，可满足24小时连续运行的需求。
如需具体选择，您可以联系我们的工程师，根据您生产线的运输方向（直线/转弯）、物料负载、工位工作条件（高粉尘/高油污/食品接触）和安装空间，获取定制的选择建议，以确保链条与生产线完美匹配。

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