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Chapter 578: The Thermos Flask
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... ul patted the thing called an air pump, or vacuum pump. It seemed to be fixed to the tabletop.
Wells moved closer to it, examining it carefully.
The main body of this thing was a metal canister. At one end of the metal canister were two valves: one could only open inwards, and the other could only open outwards. A metal rod extended from the other end of the canister. This metal rod was connected to a second metal rod by a movable pivot, and the other end of the second metal rod ...
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