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Patent

Contactless pressure sensitive semiconductor switch

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TLDR
In this article, a contactless switching device in which the conventional switch contacts are replaced by a semiconductor element whose resistivity is remarkably reduced when a pressure is imposed thereon is described.
Abstract
A contactless switching device in which the conventional switch contacts are replaced by a semiconductor element whose resistivity is remarkably reduced when a pressure is imposed thereon.

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References
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Patent

Point contact negative resistance devices

Russell S Ohl
TL;DR: In this article, a negative resistance element utilizing point contact devices was proposed, which is stable and efficient in its resistance characteristic. But the negative resistance elements were not used in this paper.