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Electrical and scientific instruments and apparatus : november 20th, 1899 (1899)
Elmer G. Willyoung & Co · New York : E.G. Willyoung · leaf 66
Fig. 61. W4359. Fig. 63. W4363. W4361. Battery Switcli, 2 connections $ 7 50 W4363. 4 12 00 W4363. 6 17 50 … Fig. 66. W43t^8. 62 W4364. ^If illyouiig-s Improved Key Grade B $27 50 For insulation testing, etc. ; combines short circuit key, circuit closingkey, condenser discharge key and battery changing key. W4366. Lamberts Di§eliarire Key ^^^?® g ^2^ qJ Same as W4368, but with eccentrics to hold key…Electric apparatus and appliances · Equipment and supplies
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