Murai Shokai (Naka Ward, Nagoya City)
村井商会（名古屋市中区）
No information on this company, other than the 1954 model appears to have used a Mitsubishi engine. Murai Shokai was perhaps in business between 1954 and 1956. The model they produced was called the 'Black Horse' ( ブラックホース号) which was of 175cc displacement.
