(under subclass 282) Subject matter wherein the duplex system comprises a circuit type wheatstone-bridge in which substantial neutrality of a receiving apparatus to transmitted currents is obtained by impedance balance.
SEE OR SEARCH CLASS
333, Wave Transmission Lines and Networks,
117, for a hybrid circuit, per se.
379, Telephonic Communications,
345, for a hybrid circuit used with a telephone repeater and subclasses 402+ for hybrid circuit used in telephone line interfacing.
