发明授权
US4157552A Pen holding device for an automatic drafting device 失效
用于自动牵伸装置的笔保持装置

Pen holding device for an automatic drafting device
摘要:
A pen holding device has a pen or pens slidable in a pen holder which is fixed removably to a drafting head frame. The pens are moved up and down by actuating means mounted on the drafting head frame, for drafting and mooring. The engagement of the actuating means to the pens are very easily released by a single releasing mechanism for easy and quick exchange of the pens.
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