| 摘要 |
A mercury sphygmomanometer has an air pump connected to the top of a mercury passage through a tube so that the pump is activated in response to an operation of closing a cover. Accordingly, it is possible to return the mercury left in the mercury passage to the mercury reservoir by means of the air pump which is activated in response to a cover closing operation and close the valve after the mercury has been expelled from the mercury passage to thereby cut off the communication between the mercury passage and the mercury reservoir.
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