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Electrical and scientific instruments and apparatus : november 20th, 1899 (1899)
Elmer G. Willyoung & Co · New York : E.G. Willyoung · leaf 137
Fig. 1(J(>. W6030. Thomson Double-Focus Tube. 132 … Fig. 101. Single Focus Tube with Regulator.If without regulator tlie offshoot is omitted. 133 X-RAY TUBES WITH REGULATOR. W6030. TIioin§oii Universal Double-Focus Tube (for Tesla coils only) $13 00 W6031. Sing-le-Focus Tube, for 15 coil 13 00 W6033. 10&13 10 00 W6033. 6&8 9 00 W6034. 4 8 00…Electric apparatus and appliances · Equipment and supplies
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