Acoustic horn

Details Acoustic horn Acoustic horn

1985-02-19

1987-09-01

Kemper, Catherine E.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D02916630

REFERENCES:
patent: D114960 (1939-05-01), Nielsen
patent: D215977 (1969-11-01), Berns
patent: D215978 (1969-11-01), Berns
patent: D226137 (1973-01-01), Selsly

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