|Note_en=stand for beginning of 30s. Advertising for the spring-less filling system, italian patent {{Cite patent|IT|4572-1929}}, almost surely the same of {{Cite patent|US|1784078}}. | |Note_en=stand for beginning of 30s. Advertising for the spring-less filling system, italian patent {{Cite patent|IT|4572-1929}}, almost surely the same of {{Cite patent|US|1784078}}. |