Maruyama Seisakusho Co., Ltd., 1950
(株)丸山製作所
Maruyama Seisakusho made a 100cc 2 stroke machine called the Jimmy (ジミー号). According to the text in the Japanese Motorcycle History 1945-2007, due to a rubber shortage it used Datsun 4.00-16 inch tires, but no other data is available. It appears to have been a one year only company.
