US PATENT SUBCLASS 178 / 72
.~.~ Mechanical circuit retainer

Current as of: June, 1999
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70 R  DF  REPEATERS {16}
71.1  DF  .~ Automatic in either direction {14}
72.~.~ Mechanical circuit retainer

DEFINITION

Classification: 178/72

(under subclass 71) Automatic repeaters in which the relay armature of the outgoing circuit is mechanically held by locks, catches, stops, etc., from breaking the circuit when the receiving relay opens the circuit.