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发明名称
Retard device
摘要
申请公布号
US1889802(A)
申请公布日期
1932.12.06
申请号
US19300451158
申请日期
1930.05.09
申请人
FERRIS ERVIE A
发明人
FERRIS ERVIE A.
分类号
G05D23/13
主分类号
G05D23/13
代理机构
代理人
主权项
地址
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