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发明名称
Machine for cutting unbreakable watch crystals
摘要
申请公布号
US1757952(A)
申请公布日期
1930.05.13
申请号
US19270237725
申请日期
1927.12.05
申请人
CAMPBELL MILTON C
发明人
CAMPBELL MILTON C.
分类号
C03B33/04
主分类号
C03B33/04
代理机构
代理人
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