| 摘要 |
A cryogenic storage device is disclosed having a tank with an open top and a wall which defines an interior chamber adapted to receive biological specimens. A fluid reservoir is disposed around at least a portion of the wall on an outer surface of the wall and this fluid reservoir receives a liquefied gaseous material, such as liquid nitrogen. The source of the liquid gaseous material is fluidly connected through a valve to the reservoir to maintain the level of the liquefied gaseous material between preset limits in the reservoir thus cooling the interior of the interior chamber and any biological specimens contained within the interior of the chamber.
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