US PATENT SUBCLASS 238 / 156
.~.~.~.~ Base plate or bolted

Current as of: June, 1999
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238 /   HD   RAILWAYS: SURFACE TRACK

151  DF  RAIL JOINTS {28}
152  DF  .~ Insulated {3}
154  DF  .~.~ Chair {2}
155  DF  .~.~.~ Twin {1}
156.~.~.~.~ Base plate or bolted

DEFINITION

Classification: 238/156

(under subclass 155), but using a separate base-plate upheld by the twin-chair sections or in which the twin-chair sections are base bolted together.