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Block and tackle - Wikipedia
Cable / Wire Rope Pulleys | Rigging Warehouse
Yale Pulley blocks, hinged, with single steel sheave
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color river Pulley Wheel Stainless Steel Small Pulley Block 360 Degree Rotating Silent Cable Pully Load Bearing Mechanical Pulleys, Silver (Silver-1) : Amazon.ca: Industrial & Scientific
Sumpley Heavy Duty Lightweight Aluminum Cable Pulleys with Hanging Strap Kit,Snatch Block Pulley Wheel for Home Gyms LAT Pulley System DIY Attachment Home Accessories : Amazon.ca: Industrial & Scientific