File:LeblancFDM.jpg

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Description
English: The multiple telegraph (FDM) circuit of Hutin and Leblanc from 1891
Français : Le circuit télégraphique multiple (FDM) de Maurice Hutin et Maurice Leblanc de 1891
Date 9 May 1894 (filed)
Source US patent US0838545 - MULTIPLE TELEGRAPHY AND TELEPHONY.
Author Maurice Hutin, Maurice Leblanc
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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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The original description page was here. All following user names refer to en.wikipedia.
  • 2009-06-05 17:37 Spinningspark 1000×1154× (250606 bytes) {{Information |Description=The multiple telegraph (FDM) cicuit of Hutin and Leblanc from 1891 |Source=US patent US0838545 |Date=9 May 1894 (filed) |Author=Maurice Hutin, Maurice Leblanc |other_versions= }} == Licensing == {{PD-US-patent}} {{KeepLocal}}

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current21:34, 6 November 2023Thumbnail for version as of 21:34, 6 November 20231,000 × 1,154 (245 KB)Clarioio (talk | contribs){{Information |Description=The multiple telegraph (FDM) circuit of Hutin and Leblanc from 1891 |Source=US patent US0838545 |Date=9 May 1894 (filed) |Author=Maurice Hutin, Maurice Leblanc |Permission={{PD-US-patent-no notice}} |other_versions= }}

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