Piccardi
{{PatentInfo |Inventor=Max Heerklotz |Assignee=Simplo Füllfeder Gesellshaft Voss, Lausen & Dziabor |Country=US |ApplicationNum=457146 |ApplicationDate=1930-05-29 |PatentNum=1826246 |PatentDate=1931-10-06 |PriorityDate=1929-09-04 |Titolo=Closure for s...