US PATENT SUBCLASS 422 / 922
.~ Pipettes, i.e., with only one conduit for withdrawing and redistributing liquids [B01L 3/02C]

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422 /   HD   CHEMICAL APPARATUS AND PROCESS DISINFECTING, DEODORIZING, PRESERVING, OR STERILIZING

919  DD  BURETTES; PIPETTES [B01L 3/02] {5}
922.~ Pipettes, i.e., with only one conduit for withdrawing and redistributing liquids [B01L 3/02C] {1}
923  DD  .~.~> Plunger pump type [B01L 3/02C3] {6}