Sound powered telephone handset

Details Sound powered telephone handset Sound powered telephone handset

1994-02-24

1995-03-14

Holtje, Nelson C.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Patent

active

D03563154

REFERENCES:
patent: D46267 (1914-08-01), Setter
patent: D83599 (1931-03-01), Eaton et al.
patent: D186439 (1959-10-01), Oules
patent: D306863 (1990-03-01), Gallagher
patent: D331583 (1992-12-01), Gallagher
patent: 2050097 (1936-08-01), Kalenoff
patent: 2410434 (1946-11-01), Edwards et al.
patent: 2475303 (1949-07-01), Allen et al.

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