A.C. test set (electrodynamometer ammeter, voltmeter and wattmeter) no. L 177196, by the Cambridge Instrument Co. Ltd., England, voltage ranges 50v-500v and current ranges 5A-25A A.C. test set 1940-1950
Test set type 74A for I.F.F. equipment, 1939 - 45 Test set type 74A for I.F.F. equipment, 1939 - 45 1939-1945