Click Here to Continue Viewing Current Query Results or Home to Start a New Query. Description: Allegro L, Pressure Adjust, Black Manufacturer: Allegro Machine Co. S.A. Type: Allegro Type Country: Switzerland Patent: Eng - 495006(4/11/1938); US 1862457(6/7/1932), 1863431(6/14/1932), 2119264(5/31/1938) Comment: Source: twillard Editors: