Combined transmitter and receiver alarm unit for children

Details Combined transmitter and receiver alarm unit for children Combined transmitter and receiver alarm unit for children

1988-05-18

1990-11-20

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Alarm or control thereof

Patent

active

D03122220

REFERENCES:
patent: D260008 (1981-07-01), Wistrand
patent: D275375 (1984-09-01), Schwartz
patent: D291975 (1987-09-01), Ching-Hua
patent: D292178 (1987-10-01), Yodsnukis et al.

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