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Facts about "Patent-GB-397736.pdf"
Application dateDecember 9, 1932 +
Application number35024/32 +
Assigned toMirko Chelazzi, Dino Frulli +
Invented byMirko Chelazzi + and Dino Frulli +
Patent dateAugust 31, 1933 +
Patent descriptionPenna doppia +
Patent number397736 +
Patent titleImprovements in and relating to twin fountain pens +
Patented byZerollo +
Patented inGB +
Priority dateDecember 9, 1930 +
Same invention ofFile:Patent-US-1893130.pdf + and File:Patent-FR-728038.pdf +