Combined portable microphone and speaker

Recording – communication – or information retrieval equipment – Video or audio transmission – recording or playback equipment – Combined

Patent

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Details

D14214, D14226, 1401

Patent

active

D04127056

REFERENCES:
patent: D276158 (1984-10-01), Lee et al.
patent: D315736 (1991-03-01), Takagi
patent: D374671 (1996-10-01), Tatsumi

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