(under subclass 65) Subject matter wherein the structure is some means for shielding at least part of the amplifier from external electric or magnetic fields, or such structure to protect parts of the device from undesired electric or magnetic fields originating in another part of the device, or such structure to prevent the amplifier or a part thereof from emanating undesired electric or magnetic fields.
SEE OR SEARCH THIS CLASS, SUBCLASS:
170, for shielding involved in interstage transformers.
190, for shielding involved in input transformers.
197, for shielding involved in output transformers.
SEE OR SEARCH CLASS 174, Electricity: Conductors and Insulators,
32+, for miscellaneous anti-inductive structures, see particularly subclasses 35+ for miscellaneous electrical shields and screen structures not elsewhere classifiable. The search notes to subclasses 32+ indicate further fields of search for anti-inductive and shielding structures.
307, Electrical Transmission or Interconnection Systems,
89+, for anti-inductive means to prevent or modify the coupling between electrical systems, particularly subclass 91, for "shielding means". See the search notes thereunder.
333, Wave Transmission Lines and Networks,
12, for transmission line inductive or radiation interference reduction systems which include shielding means for the purpose. See the search notes thereunder.
334, Tuners,
85, for a tuner having shielding or housing means.
