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D.C. amplifier and electrometer

1960-1979

Crawley motor plough, 1919.

1914-1924

Hand Pushed Hearse

1892
"Edspot" combined Wheatstone bridge and potentiometer, type KN15, no.4831, by WPA ( Walden Precision Apparatus Ltd.), 1965-1975

"Edspot" combined Wheatstone bridge and potentiometer

1960-1979