| 摘要 |
Automatic transfer pipette means for withdrawing a given quantity of a liquid specimen from an open-topped container, characterized by the provision of means for automatically submerging a downwardly depending pipette a given distance beneath the level of the liquid. The pipette is displaced vertically relative to the container by an operating arm that also carries liquid level sensing means which are operable to position the arm a given distance above the liquid level, thereby submerging the pipette to the desired depth.
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