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

1992-07-08

1993-11-02

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

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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