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John Edward Kingsbury
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Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges
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Abstract
20,841. Kingsbury, J. E., [Western Electric Co.]. Sept. 11. Drawings to Specification. Make - and - break switches, mechanical.-The Specification describes the same arrangement of a selector for an automatic or semi-automatic exchange telephone system, and a sequence switch for controlling its action, as is described in Speci fication 20,839/09, but the claims relate only to the construction of the selector.
GB190920841D1909-09-111909-09-11A Selector Switch suitable for the Automatic and Selective Switching of Telephone Lines.
ExpiredGB190920841A
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