2024

Rain and sewage inspection well grid type fall prevention device

Utility model patent certificate

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Nitrogen and cold recovery system after use of liquid nitrogen

Utility model patent certificate

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Heat recovery and energy saving system of air compressor for fermentation

Invention patent certificate

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Air-cooled direct expansion air conditioner

Utility model patent certificate

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Roof structure

Utility model patent certificate

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Variable frequency water pump control device and HVAC system

Utility model patent certificate