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CNS 257 Standard english version introduction

CNS General No. CNS 257
Classified No. B3083
Boiler Rivet Hole Reamer, with Square Head
鍋爐鉚釘孔鉸刀(方頭圓柱柄)
Date of Approval
Bureau of Standards, Metrology and Inspection Date of Revision
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CNS Standard Code CNS 257
CNS Standard Classified No. B3083
CNS Standard English Title Boiler Rivet Hole Reamer, with Square Head
CNS Standard Chinese Title 鍋爐鉚釘孔鉸刀(方頭圓柱柄)
CNS Standard Edition 09/25/1952
CNS Standard Pages 1
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