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发明名称
Improvements in an orchestral instrument
摘要
申请公布号
GB390574(A)
申请公布日期
1933.04.13
申请号
GB19310034883
申请日期
1931.12.16
申请人
HANS LUEDTKE
发明人
分类号
G10H1/18
主分类号
G10H1/18
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