Electronic token

Details Electronic token Electronic token

1994-12-07

1997-01-28

Tung, M. H.

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Telephone equipment

Patent

active

D03776476

REFERENCES:
patent: D169400 (1953-04-01), Wales
patent: D193363 (1962-08-01), Foss et al.
patent: 4926031 (1990-05-01), Stengel
patent: 4969549 (1990-11-01), Eglise
patent: 5032708 (1991-07-01), Comerford et al.
patent: 5049728 (1991-09-01), Rovin
patent: 5091771 (1992-02-01), Bolan et al.
patent: 5300764 (1994-04-01), Hoshino et al.

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