US PATENT SUBCLASS 238 / 253
.~.~ Bolt keys

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

151  DF  RAIL JOINTS {28}
243  DF  .~ Splice bars {18}
253.~.~ Bolt keys

DEFINITION

Classification: 238/253

Splice-bar joints with transverse keys engaging apertures or notches in the bolts.