Revision history of "File:Patent-GB-397736.pdf"

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关于“Patent-GB-397736.pdf”的事实
Application date1932年12月9日 (五) +
Application number35024/32 +
Assigned toMirko Chelazzi, Dino Frulli +
Invented byMirko Chelazzi +和Dino Frulli +
Patent date1933年8月31日 (四) +
Patent descriptionPenna doppia +
Patent number397736 +
Patent titleImprovements in and relating to twin fountain pens +
Patented byZerollo +
Patented inGB +
Priority date1930年12月9日 (二) +
Same invention ofFile:Patent-US-1893130.pdf +File:Patent-FR-728038.pdf +