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A Device for Securing Papers to Drawing Boards, Notice Boards and the like.
A Device for Securing Papers to Drawing Boards, Notice Boards and the like.
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机译:一种将纸张固定到绘图板,公告板等的装置。
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摘要
3381. Wakerley, H., and Wakerley, W Feb. 10. Clamps, screw; clips.-Papers are clamped to drawing-boards, notice boards, &c. b by means of a disk or plate a either rotatable about a pin c or screwing up and down thereon.
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