sigh007 发表于 2012-3-22 15:56:12

MIL-V-43511C


                   MIL-V-43511C, MILITARY SPECIFICATION: VISORS, FLYER'S HELMET, POLYCARBONATE (16 JUL 1990) ., This specification covers general and performance requirements for curved polycarbonate flyer's helmet visors worn by aircrew personnel.         
         

liuna111 发表于 2017-4-24 09:49:07

请问您有这两个标准吗？急需，谢谢！
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