- 专利标题: Ball point pen with retractable cap
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申请号: US293871申请日: 1989-01-05
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公开(公告)号: USD321718S公开(公告)日: 1991-11-19
- 设计人: Emilio Ambasz
- 申请人: Emilio Ambasz
公开/授权文献
- US6039867A Device for continuous disintegration of activated sludge 公开/授权日:2000-03-21
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