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                              | Welding nail patent certificate  | 
                           
                            
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此為國(guó)內(nèi)最早的焊釘專(zhuān)利證書(shū),標(biāo)志著我國(guó)能用自己的設(shè)備自己的技術(shù)生產(chǎn)合格的焊釘了。對(duì)當(dāng)時(shí)國(guó)內(nèi)幕墻行業(yè)成本的降低有一定貢獻(xiàn)。  | 
                           
                             
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