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William Aitken
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Individual
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Individual
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Publication of GB190815818ApublicationCriticalpatent/GB190815818A/en
15,818. Aitken, W. July 25. Drawings to Specification. Indicators or annunciators.-In an exchange telephone system, a two-way switch is combined with a revolving-drum annunciator of the kind described in Specification No. 13,312, A.D. 1906, in such a manner that the drum is restored to its normal position by the top spring of the switch when the switch is turned downwards.
GB190815818D1908-07-251908-07-25Improvements in Telephone Cordless Switchboards.
ExpiredGB190815818A
(en)