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发明名称
Drawing instrument
摘要
申请公布号
US1924094(A)
申请公布日期
1933.08.29
申请号
US19310581318
申请日期
1931.12.16
申请人
GRAHAM JOHN H
发明人
GRAHAM JOHN H.
分类号
B43L7/12
主分类号
B43L7/12
代理机构
代理人
主权项
地址
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