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发明名称
Trackball mechanism
摘要
申请公布号
US4952919(A)
申请公布日期
1990.08.28
申请号
US19890334262
申请日期
1989.04.06
申请人
TEKTRONIX, INC.
发明人
NIPPOLDT, REUBEN E.
分类号
G06F3/033
主分类号
G06F3/033
代理机构
代理人
主权项
地址
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