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Custom USA 1 ton machine screw jack,equivalent joyce screw jack,joyce dayton screw jack replacement,same sizes wj51 mini screw jacks Manufacturer,Supplier,Factory - Jacton Industry Co.,Ltd.
Locomotive appliances . Fig. 1jChapman Screw Jack. Fig. 2.Joyce Double Movement Screw Jack. for instant use in case of break-down on the road, andunless the screw portion is properly protected, theysoon rust