sound castings
所有部件均经过特殊防氧化处理，不生锈、耐化学物质腐蚀，接头为坚实的喷丸铸件，产品使用寿命高达30年以上，无须维护。
All parts of the ladderspan are anti-oxygenation, with interlocks made by casting of spray pellet, which provides itself a lifespan of 30 years more.
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