US PATENT SUBCLASS 422 / 927
.~.~.~ Having several coaxial pistons [B01L 3/02C3P]


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

919  DD  BURETTES; PIPETTES [B01L 3/02] {5}
922  DD  .~ 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}
927.~.~.~ Having several coaxial pistons [B01L 3/02C3P]