US PATENT SUBCLASS 178 / 71.13
.~.~ Relay only

Current as of: June, 1999
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178 /   HD   TELEGRAPHY

70 R  DF  REPEATERS {16}
71.1  DF  .~ Automatic in either direction {14}
71.13.~.~ Relay only

DEFINITION

Classification: 178/71.13

Relay only:

(under subclass 71.1) Telegraph repeater using exclusively electromechanical operated contact.