Sound of nature monitor

Details Sound of nature monitor Sound of nature monitor

1995-05-10

1996-07-23

Jackson, Marcus A.

Measuring, testing, or signalling instruments

Security or signal instrument or casing

Aural, i.e., audible

Patent

active

D03719790

REFERENCES:
patent: D293423 (1987-12-01), Portillo
patent: D360158 (1995-07-01), Hamof
patent: 2928072 (1960-03-01), Arnold, Jr.

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