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US4802363A Apparatus and method for measuring liquid depth 失效
用于测量液体深度的装置和方法

Apparatus and method for measuring liquid depth
摘要:
A flotation device inside an elongate frame rises to the level of a liquid whose depth is being measured. The flotation device is locked in the frame while the apparatus is withdrawn from the liquid. The liquid level may then read from a scale on the frame.
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