Non-electronic sound amplifier

Details Non-electronic sound amplifier Non-electronic sound amplifier

1988-09-21

1990-09-11

Ansher, Bernard

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Speaker or housing therefor

Patent

active

D03105300

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patent: 4551584 (1985-11-01), Mathiasen
patent: 4574912 (1986-03-01), Fuss et al.
patent: 4771859 (1988-09-01), Breland

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