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2. Differential pulley - Wikipedia

   en.wikipedia.org/wiki/Differential_pulley

   Because there is a traveling pulley at the load, this doubles the mechanical advantage of the fixed (anchored) sprocket assembly, leading to a total mechanical advantage of 2 × ⁠ P 1 / P 1 − P 2 ⁠. For instance, a 1-ton differential chain fall might have a 15-pocket and a 14-pocket sprocket set.

3. Hoist (device) - Wikipedia

   en.wikipedia.org/wiki/Hoist_(device)

   Hoist atop an elevator. A hoist is a device used for lifting or lowering a load by means of a drum or lift-wheel around which rope or chain wraps. It may be manually operated, electrically or pneumatically driven and may use chain, fiber or wire rope as its lifting medium.

4. Engine crane - Wikipedia

   en.wikipedia.org/wiki/Engine_crane

   The electric chain hoist, also known as the "electric hoist", is the least used type of engine crane. The operation is similar to the chain hoist in the way that chains are used to lift the engine. The electric chain hoist uses an electric motor operated by remote control to lift the engine, unlike the chain hoist where the operator has to ...

5. American Crane Corporation - Wikipedia

   en.wikipedia.org/wiki/American_Crane_Corporation

   American Manufacturing Company invented further enhancements to the construction industry by establishing steam-powered hoists in 1889 and the largest electric hoists, up to 15 hp. American Hoist & Derrick (AmHoist): 1892–1985

6. Euclid Trucks - Wikipedia

   en.wikipedia.org/wiki/Euclid_Trucks

   The Euclid Company of Ohio made specifically-designed off-road heavy haulers, compared with other companies that modified on-road trucks for off-road earth-hauling.. The Euclid Crane and Hoist Co., formed in 1909 and owned by George A. Armington and his five sons, had become a large, respected and profitable operation by the early 1920s.

7. Ledex - Wikipedia

   en.wikipedia.org/wiki/Ledex

   Ledex was founded by G.H. Leland. Its predecessor was GH Leland Engineering in Dayton Ohio. Patents were filed on its behalf in 1950. The company is currently owned by Hong Kong company, Johnson Electric, and Ledex Solenoids are sold under Johnson Electric Industrial. Johnson Electric in North America is located north of Dayton Ohio.