File:Krupp-renn Johannsen patent US1964917.png
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Summary
[edit]DescriptionKrupp-renn Johannsen patent US1964917.png |
Français : Premier brevet américain de Friedrich Johannsen sur le procédé Krupp-renn.
English: Friedrich Johannsen first american patent for the Krupp-renn process. |
Date | |
Source | US Patent Office |
Author | Friedrich Johannsen (1897-1983) |
Licensing
[edit]Public domainPublic domainfalsefalse |
In general, the contents of United States patents are in the public domain.
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current | 20:19, 27 January 2021 | 1,153 × 454 (135 KB) | Borvan53 (talk | contribs) | Uploaded a work by Friedrich Johannsen (1897-1983) from [https://patents.google.com/patent/US1964917 US Patent Office] with UploadWizard |
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File change date and time | 17:45, 27 January 2021 |