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发明名称
Changeable display amusement device
摘要
申请公布号
US2688820(A)
申请公布日期
1954.09.14
申请号
US19500175700
申请日期
1950.07.25
申请人
SHEMET ALEXANDER M
发明人
SHEMET ALEXANDER M.
分类号
A63H33/22
主分类号
A63H33/22
代理机构
代理人
主权项
地址
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