Hirano Manufacturing Co., Ltd., Nagoya, 1951-61
株式会社平野製作所
Hirano Manufacturing made a line of small 49cc to 78cc 2 stroke scooters called the Popet (ポペツト号) and the Pop (ポップ号) between 1952 and 1961, plus the Hirano Auto (ヒラノオート号) and Z (ゼツト号) 123cc and 173cc 2 stroke motorcycles.
They also made a suitcase style mini-scooter, either under license or copied from the French Valmobile which you can read about at this link.