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发明名称
Improvements in electric signalling devices for ships
摘要
申请公布号
GB346659(A)
申请公布日期
1931.04.14
申请号
GB19290038314
申请日期
1929.12.14
申请人
ALFRED GRAHAM & COMPANY, LIMITED;CYRIL HUGH VAUGHAN
发明人
分类号
B63H21/22
主分类号
B63H21/22
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