1912 ca BOSCH DUEL IGNITION DU and ZR Magnetos screenshots
1912 ca. BOSCH DU Magneto page 20 of 32 screenshot
1912 ca. BOSCH DU Magneto page 4 of 32 screenshot
1912 ca. BOSCH DU Magneto page 7 of 32 screenshot
1912 ca. BOSCH DUEL IGNITION DU and ZR Magneto Front cover screenshot