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经营范围
发明名称
Improvements in or relating to sound pressure receivers
摘要
申请公布号
GB781392(A)
申请公布日期
1957.08.21
申请号
GB19550014698
申请日期
1955.05.20
申请人
WILLI DOWIDAT
发明人
分类号
G10K13/00
主分类号
G10K13/00
代理机构
代理人
主权项
地址
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