Dual-tone multi-frequency microphone

Details Dual-tone multi-frequency microphone Dual-tone multi-frequency microphone

2000-07-18

2001-04-17

Bondade, Nanda (Department: 2912)

Recording, communication, or information retrieval equipment

Video or audio transmission, recording or playback equipment

Element or attachment

Design Patent

active

D0440560

CLAIM:
The ornamental design for a dual-tone multi-frequency microphone, as shown and described.

REFERENCES:
patent: D. 253767 (1979-12-01), Peterson
patent: D. 281419 (1985-11-01), Nagele
patent: D. 303116 (1989-08-01), Richards et al.
patent: D. 376599 (1996-12-01), Lindeman et al.
patent: D. 378820 (1997-04-01), Tokiyama et al.
patent: D. 388094 (1997-12-01), Tokiyama
patent: 2587684 (1952-03-01), Bauer

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