DK78971C -
Coupling for generating an electrical oscillation whose amplitude and frequency depend on the amplitude and frequency of an input oscillation.
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Coupling for generating an electrical oscillation whose amplitude and frequency depend on the amplitude and frequency of an input oscillation.
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DK258948A1947-08-251948-08-21
Coupling for generating an electrical oscillation whose amplitude and frequency depend on the amplitude and frequency of an input oscillation.
DK78971C
(en)