Combined transmitter and receiver for acoustical and optical ale

Details Combined transmitter and receiver for acoustical and optical ale Combined transmitter and receiver for acoustical and optical ale

1993-06-18

1995-07-11

Gandy, James M.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03601587

REFERENCES:
patent: D274992 (1984-08-01), Levin
patent: D275088 (1984-08-01), Kachi et al.
patent: D312797 (1990-12-01), Lomas
patent: D344036 (1994-02-01), Yuen

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