BS EN 1092-2-1997 Flanges and their joints. Circular flanges for pipes, valves, fittings and accessBS EN 1092-2-1997 Flanges and their joints. Circular flanges for pipes, valves, fittings and accessories, PN designated. Cast iron flanges
部份国外标准涉及版权问题,所以全部国外标准于2013年02月,全部删除!相关页面仅提供参考消息。