US PATENT SUBCLASS 166 / 235
.~ Stacked annular sections

Current as of: June, 1999
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166 /   HD   WELLS

227  DF  SCREENS {7}
235.~ Stacked annular sections

DEFINITION

Classification: 166/235

(under subclass 227) Devices comprising a vertically aligned assembly of annular units which provide straining openings between themselves or at least two of which have straining openings in themselves.