Acoustic horn

Details Acoustic horn Acoustic horn

1989-07-20

1991-06-25

Burke, Wallace R.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03177270

REFERENCES:
patent: D114960 (1939-05-01), Nielsen
patent: D215977 (1969-11-01), Berns
patent: D215978 (1969-11-01), Berns
patent: D226137 (1973-01-01), Selsby
patent: D291663 (1987-09-01), Parsons et al.
patent: D292498 (1987-10-01), Hayashi
patent: 4710749 (1987-12-01), Berke et al.

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