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{{PatentInfo |Inventor=Hermann Burkhardt, Paul Grob-Hablützel |Assignee=Hermann Burkhardt, Paul Grob-Hablützel |Country=GB |ApplicationNum=26686/26 |ApplicationDate=1926-10-25 |PatentNum=260304 |PatentDate=1928-01-25 |PriorityDate=1925-10-26 |Titolo...