Invention Grant
US6149333A Writing instruments 失效
书写工具

Writing instruments
Abstract:
A ball-point pen which includes a shaft 16 which engages with balls 10 and 18 of rubbery elastic material at each end, ball 10 acting as the cap of the pen. When dropped or thrown, these balls will cause it to bounce in an entertaining fashion. The shaft 16 also has a relatively soft rubber sleeve 28.
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