Oku Industry (Aichi Prefecture Ohufu city)
Data provided by Kazuya Tomari Kenya, from the https://yaplog.jp web site
The ad line was "Easy to operate, safe for women and children" and "Your bicycle will be a scooter." The Baby Climber was a bicycle clip-on that drove the rear wheel via a rubber roller type of drive. Offered in the late 1950's, it was available in 50, 60 and 75cc versions.