US PATENT SUBCLASS 246 / 161
.~ Retarded-release mechanism


Current as of: June, 1999
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246 /   HD   RAILWAY SWITCHES AND SIGNALS

131  DF  INTERLOCKING {8}
161.~ Retarded-release mechanism


DEFINITION

Classification: 246/161

(under subclass 131) Subject matter having mechanism for preventing the reversal of a switch or signal movement until after the lapse of a definite interval of time.

SEE OR SEARCH CLASS

70, Locks,

267, 274, for mechanically or electrically-operated time-interval controlled locks.