US PATENT SUBCLASS 175 / 312
.~ Sieve or strainer

Current as of: June, 1999
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175 /   HD   BORING OR PENETRATING THE EARTH

308  DF  WITH RECEPTACLE {4}
312.~ Sieve or strainer

DEFINITION

Classification: 175/312

(under subclass 308) Apparatus in which the receptacle is either porous or is provided with apertures.

SEE OR SEARCH THIS CLASS, SUBCLASS:

206, for above ground separation of drilling fluid constituents.