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发明名称
Haut-parleurs à diffusion en expansion circulaire
摘要
申请公布号
FR931952(A)
申请公布日期
1948.03.09
申请号
FRD931952
申请日期
1946.08.05
申请人
发明人
BLANCHARD FRANCOIS-JULES-MARCE
分类号
H04R1/34
主分类号
H04R1/34
代理机构
代理人
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