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Arnold Birner was a neighbor of John Athan and owned a modified in the early Forties and a belly tank after the war. He was photographed at Harper with this Riley four-port roadster that came before either of them. When the war ended, Arnold started working as a pattern maker for Ed Donovan, who continued to build four-bangers. The stylized AJB symbol found on Donovan blocks represents Birner's initials.