This paper discusses the common problems in the design of frame calculation sketch and stress distribution at corner of the jetted plate.

本文试对框架的计算简图和悬挑板转角处应力分布两个设计中常见的问题作一探讨。

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Then an electrical technician, Cassagnes came upon the Etch A Sketch idea in the late 1950s when he peeled a translucent decal from a light switch plate and found pencil mark images transferred to the opposite face, the Toy Industry Association said.

NPR: Inventor Of Etch A Sketch Dies In France At 86