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In 1959, after running Heikkinen Machine Shop with his brothers for over a decade, Heikkinen incorporated Prentice Hydraulics. [7] With Prentice Hydraulics, Heikkinen excelled due to selling his knuckleboom loader, a revolutionary design for pulpwood loaders that allowed a single operator to load a truck through a design that featured essentially a “yo-yo” and “claw” versus manually ...
In 1994, Rowan (now Valaris Limited), which had used the company to manufacture its drilling rigs, acquired the company from General Cable for $50 million. [4] [5] In 2011, Rowan (now Valaris Limited) sold LeTourneau Technologies to Joy Global. [6] Joy Global subsequently sold LeTourneau's Drilling, Marine, and Power divisions to Cameron ...
A logging donkey consists of a steam boiler and steam engine, [5] [6] connected to a winch mounted on a sled called a donkey sled. [7] [8] The donkeys were moved by simply dragging themselves with the winch line, originally hemp rope and later steel cable. They were used to move logs, by attaching lines to the logs and hauling them. [9] [10]
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Solid, low pressure and high pressure tires have been used. As many as nine axles may be used to provide low ground pressure and good traction. [6] Timber is commonly grown in hilly country unsuitable for farming and so the ability of a log truck to climb a gradient is significant. The steepness depends on the quality of the surface - mud and ...
A yarder is piece of logging equipment that uses a system of cables to pull or fly logs from the stump to a collection point. [1] It generally consists of an engine, drums, and spar, but has a range of configurations and variations, such as the swing yarder. Clyde Skidder at Marathon Logging Camp near Newton, MS ~1921 Madill 124 Yarder. An ...