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发明名称
Roofing granules and method of producing same
摘要
申请公布号
US1954778(A)
申请公布日期
1934.04.10
申请号
US19320640733
申请日期
1932.11.01
申请人
NICHOLS ERNEST H
发明人
NICHOLS ERNEST H.
分类号
E04D7/00
主分类号
E04D7/00
代理机构
代理人
主权项
地址
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