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发明名称
Automatic signaling mechanism for schools
摘要
申请公布号
US1916769(A)
申请公布日期
1933.07.04
申请号
US19320614183
申请日期
1932.05.28
申请人
MERCER EDWARD R
发明人
MERCER EDWARD R.
分类号
G04C21/30
主分类号
G04C21/30
代理机构
代理人
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