Guitar string tuning machine

Musical instruments – String instrument – Element or attachment

Patent

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D1703

Patent

active

D02564718

REFERENCES:
patent: D210981 (1968-05-01), Thompson
patent: D216049 (1969-11-01), Dreyer
patent: D249583 (1978-09-01), Worthing et al.
patent: 2771808 (1956-11-01), Jenkins
patent: 4098163 (1978-07-01), Kato

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