Portable signalling transmitter for disabled persons

Details Portable signalling transmitter for disabled persons Portable signalling transmitter for disabled persons

1988-07-08

1991-02-19

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D03147185

REFERENCES:
patent: D193596 (1962-09-01), Waltman
patent: D198956 (1964-08-01), Kress
patent: D223926 (1972-06-01), Kahn
patent: D224785 (1972-09-01), Dean, Jr.
patent: D225905 (1973-01-01), Lincoln
patent: D239706 (1976-04-01), Baileen
patent: D273848 (1984-05-01), Monahan
patent: 3226705 (1965-12-01), Kaufman et al.
patent: 3797006 (1974-03-01), Reininger

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