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Retrieved from "http://fountainpen.it/File:Patent-US-1893130.pdf"
Fatti riguardanti Patent-US-1893130.pdf
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Application datedicembre 9, 1931 +
Application number579966 +
Assigned toMirko Chelazzi, Dino Frulli +
Invented byMirko Chelazzi + e Dino Frulli +
Patent dategennaio 3, 1933 +
Patent descriptionPenna doppia +
Patent number1893130 +
Patent titleFountain pen +
Patented byZerollo +
Patented inUS +
Priority datedicembre 9, 1930 +
Same invention ofFile:Patent-FR-728038.pdf + e File:Patent-GB-397736.pdf +