(under subclass 309) Subject matter wherein the keying device has its control part located at a point some distance removed from the transmitter.
(1) Note. This subclass includes relay controlled keying, wherein the operator key controls the relay, the armature controlled contacts being in the transmitter circuit.
(2) Note. This distance between the operator key and the transmitter circuit controlled thereby may be considerable or the distance may be small as with relay controlled keying.
