US PATENT SUBCLASS 178 / 71.1
.~ Automatic in either direction

Current as of: June, 1999
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178 /   HD   TELEGRAPHY

70 R  DF  REPEATERS {16}
71.1.~ Automatic in either direction {14}
72  DF  .~.~> Mechanical circuit retainer
73  DF  .~.~> Multiple line
71.2  DF  .~.~> Distributor
71.3  DF  .~.~> Mechanical
71.4  DF  .~.~> Generator
71.5  DF  .~.~> Artificial line and relay
71.6  DF  .~.~> Vacuum tube and gas magnetron
71.7  DF  .~.~> Code transformer
71.8  DF  .~.~> Oscillatory
71.9  DF  .~.~> One-way repeater switched
71.11  DF  .~.~> Piezoelectric
71.12  DF  .~.~> Vacuum tube and relay
71.13  DF  .~.~> Relay only
71.14  DF  .~.~> Supervisory, alarm, monitor

DEFINITION

Classification: 178/71.1

Automatic in either direction:

(under subclass 70) Telegraph repeater R which operates in either direction without the interposition or aid of an operator at the repeating station.