Optical detector

Details Optical detector Optical detector

1987-07-30

1990-06-19

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Lost child or person locator

Patent

active

D03086470

REFERENCES:
patent: D71165 (1926-09-01), Suren
patent: D194210 (1962-12-01), Midlock
patent: 2980594 (1961-04-01), Pankove
patent: 3004835 (1961-10-01), Verner et al.
patent: 3225250 (1965-12-01), Hershberger

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