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| Welding nail patent certificate |
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| Detailed information： |
此為國內(nèi)最早的焊釘專利證書，標(biāo)志著我國能用自己的設(shè)備自己的技術(shù)生產(chǎn)合格的焊釘了。對當(dāng)時國內(nèi)幕墻行業(yè)成本的降低有一定貢獻。 |
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