H03G 9/08
Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for gain control and tone control incorporating negative feedback
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Edits on 16 Mar, 2022
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Edits on 5 Mar, 2022
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H03G 9/08
Combinations of two or more types of control, e.g. gain control and tone control in untuned amplifiers having discharge tubes for gain control and tone control incorporating negative feedback
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