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- official websiteenshi vocational and technical collegeit is a pipeline equipment sales and manufacturing company. it mainly sells carbon steel press-type pipe fittings, fire-fighting carbon steel press-type pipe fittings, stainless steel press-type pipe fittings, plastic-coated steel pipes, press-type three-way, press-type fire-type elbows, fire-type pipe fittings and other products, and its products are widely used.hebei longjin pipe equipment co., ltd.'s main products are carbon steel press fittings, fire-fighting press fittings, plastic-coated press fittings, and registered trademarks arebeijing chaoyang data centerjada villa lightingplastic-coated press fittings-
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