Deutsch: Zeichnung einer historischen Glühlampenkonstruktion mit Stopper-Design
Datum
Bron
veröffentlichtes US-Patent 503.670 von 1893
Auteur
WILLIAM EMERY NICKERSON
Licentie
Public domainPublic domainfalsefalse
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.
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