(under subclass 170) Devices comprising means specially adapted for cleaning perforations in well conduits.
(1) Note. These devices either comprise means disclosed as entering the perforations of a well conduit, means claimed in combination with a perforated conduit or means claimed as adapted to be used for cleaning perforated conduits. Cleaners which may be used for perforation cleaning but do not qualify under this note may be found in subclass 170 or indented subclasses other than subclass 171.
SEE OR SEARCH CLASS
210, Liquid Purification or Separation,
407+, for a strainer of general utility combined with cleaning means and see the search notes thereunder.
