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发明名称
An improved means for booking or indicating the availability of seats in theatres, cinemas, or similar establishments
摘要
申请公布号
GB684152(A)
申请公布日期
1952.12.10
申请号
GB19480031064
申请日期
1948.11.30
申请人
JOHANNES WILHELMUS BOON
发明人
分类号
B42D15/00
主分类号
B42D15/00
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