Combined annunciator and switching unit for hospital patients

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

Patent

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D13171

Patent

active

D03408787

REFERENCES:
patent: D214705 (1969-07-01), Brounn
patent: D282463 (1986-02-01), Barr et al.
patent: D283687 (1986-05-01), Walser
patent: D305018 (1989-12-01), Pena et al.
patent: D326238 (1992-05-01), Spinosa

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