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Class Information
Number: 330/205
Name: Amplifiers > With power or bias voltage supply > For input electrode > And filamentary cathode
Description: Subject matter wherein power supply, bias means or isolating means are supplied to the filamentary cathode of the vacuum tube amplifying device, as input electrode; and/or as cathode heating electrical current supply to the directly heated filamentary cathode.

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Patent Number Title Of Patent Date Issued

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