发明名称 Railway crossing gate assembly, components therefor and methods of making the same
摘要 A crossing gate arm comprises at least two generally tubular members having one end engagable with a portion of a crossing gate assembly wherein the opposite free end of the crossing gate arm has a part of one tubular member removed to impart flexibility to the free end.
申请公布号 US6776377(B1) 申请公布日期 2004.08.17
申请号 US20020299122 申请日期 2002.11.19
申请人 WATKINS CRAIG A. 发明人 WATKINS CRAIG A.
分类号 B61L29/02;(IPC1-7):B61L23/00 主分类号 B61L29/02
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