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Expired
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Armin Gascoigne Vavasour Elder
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Individual
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Individual
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Publication of GB191327424ApublicationCriticalpatent/GB191327424A/en
27,424. Elder, A. G. V. Nov. 28. ' Engaged ' and l i k e indicators. - Transparent indications 'In,' 'Out,' &c. are selectively illuminated by lamps 9 controlled from a switchboard 5. A bell-push 19 may be depressed by a visitor to ring the bell 6. A coil 7 controlling a bolt to fasten the door 21 may be switched into circuit with the lamp which illuminates the 'Engaged' indication.
GB191327424D1913-11-281913-11-28Improvements in or relating to "In and Out" Indicators and the like.
ExpiredGB191327424A
(en)