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File:Bucklingspring1-o.svg

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Description
English: Image from U.S. Patent 4,118,611 of buckling spring mechanism
. Was used in the Model F and was the base of the Model M "membrane buckling spring switch".
Date
Source U.S. Patent 4,118,611 / File:IBM buckling spring.svg
Author Richard Hunter Harris

Licensing

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Public domain The text and illustrations of US patents published before March 1, 1989 are in the public domain unless the patent text contains a specific notice that portions are copyrighted. See 37 CFR 1.71(d), 37 CFR 1.84(s)

The original patent contains no such notice, so its contents are in the public domain. Note: This only applies to images published before March 1, 1989. Patents published after that date are most likely copyrighted, unless in the public domain for another reason, such as {{PD-ineligible}}.

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current15:25, 31 December 2013Thumbnail for version as of 15:25, 31 December 2013360 × 381 (25 KB)Shaddim (talk | contribs)User created page with UploadWizard

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