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发明名称
Portable screen
摘要
申请公布号
US1902373(A)
申请公布日期
1933.03.21
申请号
US19310574878
申请日期
1931.11.13
申请人
SPRAGUE SPECIALTIES CO.
发明人
PINEO ORRIN WESTON
分类号
G03B21/58
主分类号
G03B21/58
代理机构
代理人
主权项
地址
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