Combined annunciator and switching unit for hospital patients

Details Combined annunciator and switching unit for hospital patients Combined annunciator and switching unit for hospital patients

1990-07-02

1992-05-19

Burke, Wallace R.

Measuring, testing, or signalling instruments

Clock or clock case

With closure panel

D10104

Patent

active

D03262383

REFERENCES:
patent: D255553 (1980-06-01), Izumi
patent: D273848 (1984-05-01), Monahan
patent: D319031 (1991-08-01), Levinson
patent: D321330 (1991-11-01), Gagnon et al.
NuTone-Electronic Products Division 1979 p. 27-1SA-53 Inside Speaker.

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