Portable telephone auxiliary tone ringer and door alarm

Details Portable telephone auxiliary tone ringer and door alarm Portable telephone auxiliary tone ringer and door alarm

1990-04-25

1992-11-24

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

D14140

Patent

active

D03312046

REFERENCES:
patent: D260741 (1981-09-01), Lam
patent: D266509 (1982-10-01), Marshall
patent: D291195 (1987-08-01), Shea
patent: D294471 (1988-03-01), Levin et al.
patent: D310219 (1990-08-01), Carlile
patent: D313593 (1991-01-01), Morooka

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