US PATENT SUBCLASS 198 / 669
.~.~.~ Of opposite hand

Current as of: June, 1999
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198 /   HD   CONVEYORS: POWER-DRIVEN

618  DF  CONVEYOR SECTION {26}
657  DF  .~ Screw {11}
662  DF  .~.~ Plural helical surface formations {4}
669.~.~.~ Of opposite hand

DEFINITION

Classification: 198/669

(under subclass 662) Apparatus wherein the plural helical surface formations comprise at least one formation of a right-handed thread and at least one formation of a left-handed thread, which formations generate flow paths which either approach, or recede from, each other.