MXA’S FORGOTTEN MOTOCROSS TECH: HOW THE ATK 604 WENT TO ENGLAND & BECAME THE AVENGER Nov 30, 2022 ATK founder Horst Leitner sold ATK and started AMP. The new ATK owner sold ATK and became ADB. AMP designed a bike for PBH who sold it to ADB. Old ATK, now ADB, sued the new ATK. Got that? Read More...