US PATENT SUBCLASS 291 / 37
.~.~ Helical guide

Current as of: June, 1999
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291 /   HD   TRACK SANDERS

25  DF  SAND FEEDERS {8}
36  DF  .~ Vertical plunger {1}
37.~.~ Helical guide

DEFINITION

Classification: 291/37

Same as 36 with addition of means for giving the plunger a turning movement as it moves up and down in the hopper.