Multi-position rotary electric switches

作者: John R Ashman

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参考文章(6)
Soreng John Edgar, Key operated switch ,(1956)
Eisler Paul, Electric circuit components ,(1952)
Siegfried K Handel, Selector switch for rotary files ,(1959)
Arthur A Hagstrom, Bernard J Sobczak, Estates Hoffman, Alonas Kay, Telegraph distributor having ratchet-like stepped contact segments and the method formaking such ,(1961)