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发明名称
Orrery-satellite orbit demonstration device
摘要
申请公布号
US3199229(A)
申请公布日期
1965.08.10
申请号
US19630261239
申请日期
1963.02.26
申请人
EASTON ROGER L
发明人
EASTON ROGER L.
分类号
G09B27/02
主分类号
G09B27/02
代理机构
代理人
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地址
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