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A dictionary of electrical engineering (1911)
Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 246
Fig. 1.—Single-poleSingle-throw Switch Fig. 2.—Single-poleDouble-throw Switch Fig. 3.—Donble-pole Single-throw Switch Fig. i Double-pole Double-throw SwitchElectrical engineering
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