US PATENT SUBCLASS 246 / 460
.~ Central inserts

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


246 /   HD   RAILWAY SWITCHES AND SIGNALS

454  DF  CROSSINGS, FROGS, AND MATES {11}
460.~ Central inserts {1}
461  DF  .~.~> Cast bound

DEFINITION

Classification: 246/460

(under subclass 454) Subject matter having crossings, frogs, and mates provided with centrally-inserted pieces of manganese or other hard steel adapted especially for resisting wear and for being replaced when worn down or destroyed.