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In between which years did hydraulic controls and three-point linkage were developed?

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In between which years did hydraulic controls and three-point linkage were developed?

(a) 1989-1993

(b) 1947-1951

(c) 1937-1941

(d) 1920-1924

This question was addressed to me in final exam.

This is a very interesting question from Tractor Classification and Details topic in chapter Lubrication System and Tractor’s Classification of Farm Machinery

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The correct answer is (c) 1937-1941

Easiest explanation: Harry Ferguson patented the three-point linkage for agricultural tractors in Britain in 1926. He and his colleagues continued to developed several innovations to this device which made the system workable, effective, desirable. In 1938, after almost two decades of trying to sell Henry Ford on using Ferguson’s system on tractors mass-produced by Ford, Ferguson finally convinced Ford. The American mass market debut was via the Ford Ferguson 9N in 1939.

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