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Patent Certificate

A gas warning relay

A multifunctional gas density relay

A multi-functional early warning gas relay

一种防歪斜压力释放阀

A transformer butterfly valve

A bypass device for transformer gas relay

A transformer pressure relief valve installation structure

A pressure plate for testing transformer pressure relief valves

A power transformer oil level gauge

A rainproof quick-acting hydraulic relay secondary line outlet pipe

A pressure relief valve with a waterproof structure

A novel pointer-type oil level gauge for transformers

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