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Facts about "Patent-US-1893130.pdf"
Application dateDecember 9, 1931 +
Application number579966 +
Assigned toMirko Chelazzi, Dino Frulli +
Invented byMirko Chelazzi + and Dino Frulli +
Patent dateJanuary 3, 1933 +
Patent descriptionPenna doppia +
Patent number1893130 +
Patent titleFountain pen +
Patented byZerollo +
Patented inUS +
Priority dateDecember 9, 1930 +
Same invention ofFile:Patent-FR-728038.pdf + and File:Patent-GB-397736.pdf +