| 摘要 |
PROBLEM TO BE SOLVED: To improve the durability (the inhibition of the generation of rust) of metal fittings by effectively executing hot dip galvanizing in various metal fittings installed onto a roof. SOLUTION: In the metal fittings on the roof having a roof installing section and a fixed working section and being used by mounting on the roof, washers are assembled and fixed among abutting metal plates at positions, where the metal plates are abutted and fixed by connecting members such as rivets, and plating treatment is executed.
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