The original invention for a "Feet Swinging Device" by Keiichi Ohashi was submitted to the Japanese Patent Office in 1988 and was granted as a patent on 20 March 1990 - Patent Number JP2080067.

This will be posted here soon.

There will also be a more detailed eBook published in the near future. To request an eBook detailing the key patents and design registrations, please send us an email.