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The John Deere PowerShift transmission was an eight-speed semi-automatic transmission without a torque converter, used in John Deere tractors, including the iconic John Deere Model 4020. [1] The Powershift is not to be confused with similar John Deere transmissions (including the Quad-Range and the PowrQuad [ 2 ] ), or with the Ford Ultra ...
The reed switch [i] is an electromechanical switch operated by an applied magnetic field. It was invented in 1922 by professor Valentin Kovalenkov at the Petrograd Electrotechnical University , [ 1 ] and later evolved at Bell Telephone Laboratories in 1936 by Walter B. Ellwood into the reed relay.
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John W. Thomason underway on 28 March 1957. From 1954-1956 John W. Thomason returned to the now-familiar waters off Korea and in the Formosa Strait, serving with the 7th Fleet. The first half of 1957 was spent in readiness exercises off San Diego. John W. Thomason then sailed on 29 July for a cruise which took her to Pago Pago, Auckland, and ...