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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 50Electric apparatus and appliances · Equipment and supplies
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