US PATENT SUBCLASS 422 / 920
.~ Burettes, i.e., for withdrawing and redistributing liquids through different conduits [B01L 3/02B]

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

919  DD  BURETTES; PIPETTES [B01L 3/02] {5}
920.~ Burettes, i.e., for withdrawing and redistributing liquids through different conduits [B01L 3/02B] {1}
921  DD  .~.~> Plunger type [B01L 3/02B2]