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发明名称
Safety crossing
摘要
申请公布号
US2157602(A)
申请公布日期
1939.05.09
申请号
US19370158810
申请日期
1937.08.12
申请人
GILMORE HARRY R
发明人
GILMORE HARRY R.
分类号
B61L29/22
主分类号
B61L29/22
代理机构
代理人
主权项
地址
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