US PATENT SUBCLASS 238 / 148
.~ Tread surfaces

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

122  DF  RAILS {20}
148.~ Tread surfaces

DEFINITION

Classification: 238/148

Special formation of rail tread-surfaces for effective

engagement with wheel tread-surfaces.

(1) Note. For rail tread-surfaces with rollers see this class, subclass 16.