Speaker volume control

Recording – communication – or information retrieval equipment – Computer – data processor equipment

Patent

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Details

D14 37, D17 20, D17 99, D1401, D1799

Patent

active

D02701537

REFERENCES:
patent: D214794 (1969-07-01), Yang
patent: 2525696 (1950-10-01), Lurie
patent: 3033930 (1962-05-01), Guzskie et al.
patent: 4143245 (1979-03-01), Scholz
Heathkit Spring '76 Cat., #808, p. 80, Item #HD-1416.

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