* [[Union]] (olandese, vedi [[:File:Patent-FR-1119961.pdf|questo brevetto]] e [https://www.protopens.com/very-rare-1930s-dutch-union-genie-19500-celluloid-hard-rubber-14k-of-super-flexible-nib-push-button-bladder-fountain-pen.html questo link]) | * [[Union]] (olandese, vedi [[:File:Patent-FR-1119961.pdf|questo brevetto]] e [https://www.protopens.com/very-rare-1930s-dutch-union-genie-19500-celluloid-hard-rubber-14k-of-super-flexible-nib-push-button-bladder-fountain-pen.html questo link]) |