(under subclass 75) Subject matter including two or more signal feedback circuit means as therein defined and not previously provided for in this schedule.
SEE OR SEARCH THIS CLASS, SUBCLASS:
88+, for cascaded amplifiers having cathode-cathode signal feedback.
90+, for cathode impedance signal feedback combined with diverse type signal feedback.
99+, for cascaded amplifiers having multiple feedbacks.
102, for amplifiers having current and voltage feedback.
