− | Brevetto per una matita meccanica multipla. {{SamePatent|DE|432836}} {{SamePatent|DE|448931}} {{SamePatent|FR|605510}} {{SamePatent|NL|19802}} | + | Brevetto per una matita meccanica multipla. {{SamePatent|DE|432836}} {{SamePatent|DE|448931}} {{SamePatent|FR|605510}} {{SamePatent|NL|19802}} {{SamePatent|US|1567910}} |