US PATENT SUBCLASS 246 / 106
.~.~.~ Lock and block

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

20  DF  BLOCK-SIGNAL SYSTEMS {4}
104  DF  .~ Manual {1}
105  DF  .~.~ Electric {1}
106.~.~.~ Lock and block

DEFINITION

Classification: 246/106

(under subclass 105) Subject matter having a signal which cannot be cleared at one end of the block until it has been

electrically unlocked by the operator at the other end.

(1) Note. The so-called "manual lock and block systems" are here included.

SEE OR SEARCH THIS CLASS, SUBCLASS:

25, 26 and 131+, for locking features.