Audio amplifier

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

Patent

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Details

D14188

Patent

active

D03165531

REFERENCES:
patent: D228390 (1973-09-01), Ohta et al.
patent: D266508 (1982-10-01), Yamamoto et al.
patent: D269615 (1983-07-01), Nishiyama et al.
patent: D293322 (1987-12-01), Hoshino et al.
patent: D293785 (1988-01-01), Wysong et al.

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