Patent certificate of cross-type keel connector-Shanghai tofflon Dehui Air Conditioning Equipment Co.

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Patent certificate of cross-type keel connector

Patent certificate of cross-type keel connector

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上海东富龙德惠空调设备有限公司资质证书

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Patent certificate of cross-type keel connector

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Patent certificate for the installation structure of modular gusset plate and profile keel

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