Takanashi Sangyo Co., Ltd. (Nagoya), 1950
高梨産業株式会社
Takanashi Sangyo Co., Ltd. was established in 1945 and is still in business today making steel furniture. They are listed in the Japanese language wikipedia site. They made a machine called the Tsukuba (つくば号 or ツクバ号) which is mentioned in their company history ( found at this link) however I have not found any other information as to whether it was a clip on, a scooter or an actual motorcycle.