Parabolic listening device

Details Parabolic listening device Parabolic listening device

1993-12-13

1995-03-07

Wallace, Terry A.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03560902

REFERENCES:
patent: D74615 (1928-03-01), Lyons
patent: 2534271 (1950-12-01), Kienow
patent: 3553731 (1971-01-01), Szirtes
patent: 4022976 (1977-05-01), O'Brien, deceased et al.
patent: 5125031 (1992-06-01), Ledonne

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