发明公开
EP0369995A2 Dual refill writing utensil 失效
AC笔两座矿山。

Dual refill writing utensil
摘要:
A writing utensil with dual refills is described, which when a cap (3) on a body (1), is rotated in one direction or the other, first and second refills (4, 5) are alternately projected and retracted from the body (1), whereby either the first or second refill can be held at an operating position whilst the other is withdrawn.
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