File:Ming Kwai 1952 US 2613795 A.png

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摘要

描述
English: Ming Kwai typewriter invented by Lin Yutang as it appears in the United States patent. Cropped image from the original.
日期
來源 https://www.google.com/patents/US2613795
作者 Campbell, Brumbaugh & Free

授權條款

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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