(under the class definition) Subject matter relating to systems having a common portion in which unlike currents flow or unlike potentials exist.
(1) Note. One of the currents, for example, may be a direct current while the other current, for example, may be a pulse current.
SEE OR SEARCH CLASS
178, Telegraphy,
49, for telegraphy having plural different types of currents superimposed upon a common circuit.
330, Amplifiers,
69, 84, 124+, 147, and 295 for amplifier systems involving plural signal input signal sources which may be superimposed. 340, Communications: Electrical, appropriate subclasses for miscellaneous communication systems having means for superimposing upon a common circuit plural types of current. Note particularly
288, 531+, 693.1+, 870.07, 870.11+, and 870.15.
370, Multiplex Communications, appropriate subclasses for multiplex systems.
379, Telephonic Communications,
66, and 90+ for telephone systems having means for superimposing upon a single circuit plural types of current.
