Combined bell and lamp

Measuring – testing – or signalling instruments – Security or signal instrument or casing – Aural – i.e. – audible

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D10114

Patent

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D03007308

REFERENCES:
patent: D44238 (1913-06-01), Hawthorne
patent: D173826 (1955-01-01), Wiswell
patent: D192275 (1962-02-01), Herscouitz
patent: D195051 (1963-04-01), Gantenbrink
patent: D278134 (1985-03-01), Jenkins
patent: D293656 (1988-01-01), Arai
patent: 1231298 (1917-06-01), Reinker
patent: 2554627 (1951-05-01), Merola
patent: 2707228 (1955-04-01), Philipson
patent: 2804611 (1957-08-01), Craddock
patent: 3424124 (1969-01-01), Jenkins
patent: 3430219 (1969-02-01), Powers
patent: 3735116 (1973-05-01), Morrison

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