File:Floatation Screen Patent.png

原始文件 (638 × 668像素,文件大小:53 KB,MIME类型:image/png


English: Floatation Screen — from US patent 2390747
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}}.

文件历史

点击某个日期/时间查看对应时刻的文件。

日期/时间缩⁠略⁠图大小用户备注
当前2009年9月10日 (四) 14:112009年9月10日 (四) 14:11版本的缩略图638 × 668(53 KB)Catsmeat{{Information |Description={{en|1=Floatation Screen — from US patent #2,390,707 {{PD-US-patent}}}} |Source=US Patient |Author=fff |Date=1942-03-13 |Permission= |other_versions= }}

以下页面使用本文件:

全域文件用途

以下其他wiki使用此文件: