发明授权
US4224009A Submersible pump with improved sealing means 失效
潜水泵具有改进的密封方式

Submersible pump with improved sealing means
摘要:
A submersible pump provided with improved labyrinth to avoid undesirable leakage of a pump fluid into the hydraulic motor of the pump and to avoid leakage of hydraulic motor into the pump.
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