Example: air traffic controller
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AN AMERICAN NATIONAL STANDARD
www.3ppars.comA N A ME R IC AN N A T IO N AL S T A NDAR D UNIFIED INCH SCREW THREADS (UN and UNR Thread Form) ASME B1.1-2003 [Revision of ASME B1.1-1989 (R2001)] 标准下载网(www.bzxzw.com)