US PATENT SUBCLASS 455 / FOR 120
.~.~ Lockout or busy-idle signalling (455/58.2)

Current as of: June, 1999
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455 /   HD   TELECOMMUNICATIONS

899  DF  MISCELLANEOUS {5}
FOR 106  DF  .~ Plural transmitters or receivers (i.e., more than two stations) (455/49.1) {4}
FOR 120.~.~ Lockout or busy-idle signalling (455/58.2)

DEFINITION

Classification: 455/FOR.120

Lockout or busy-idle signalling:

Foreign art collection wherein a transmitting operator may prevent other transmitters in the system from operating, and may generate signals indicating the status of the transmitting channel.