| 摘要 |
A spring loaded plunger actuated vacuum pipette tube is disclosed for use in combination with removable disposable molded plastic tip members wherein a plurality of adjacent concentric internal annular rings are formed within the larger open end of the tip member, and annular rings being of successively decreasing diameter progressing inwardly, for cooperative airtight frictional engagement with a smoothly tapered end surface of the pipette tube.
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