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发明名称
Improvements in navigational devices
摘要
申请公布号
GB768440(A)
申请公布日期
1957.02.13
申请号
GB19480004888
申请日期
1948.02.19
申请人
THE MINISTER OF SUPPLY
发明人
RUSSELL GRAHAM;WILLIAMS NORMAN;COOPER GEORGE RONALD
分类号
G06G7/78
主分类号
G06G7/78
代理机构
代理人
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地址
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