6 China 
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2 Belgium 
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cylindrical lens plano convex concave cylinder lenses Photos Catalog - page 35 - ECeurope Market
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Telescopic Hydraulic CylinderTransportation services equipment - Hubei Jiaheng Technology Co., Ltd. - China - January 15, 2026 - contact company for priceThe telescopic oil cylinder of tunnel construction machinery is the core hydraulic actuator of shield tunneling machines, rock drilling trolleys and other equipment. It drives the extension and retraction of mechanical arms, shields and other compone...
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Left And Right Swing Valve CylinderTransportation services equipment - Hubei Jiaheng Technology Co., Ltd. - China - January 15, 2026 - contact company for priceThe swing valve cylinder of the pump truck (also known as the S-valve swing cylinder, directional cylinder, or distribution valve cylinder) is a key hydraulic actuator that controls the left and right switching of the concrete distribution valve (usu...