US PATENT SUBCLASS 178 / 67.1
.~.~ Modified semicycle

Current as of: June, 1999
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178 /   HD   TELEGRAPHY

2 R  DF  SYSTEMS {21}
66.1  DF  .~ Alternating or pulsating current {4}
67.1.~.~ Modified semicycle

DEFINITION

Classification: 178/67.1

Modified semicycle:

(under subclass 66.1) Alternating current systems in which messages are sent by suppressing, reversing, augmenting, or otherwise modifying one or more halves of the sine or similar wave cycles on one or the other side of the line of zero potential, in accordance with a predetermined code.