Yodel Plastic Model Co.
Pro-Yo Ballistics (glow)
Sites of Interest
Yo-Yo History of Bob Rule
Patents & Resources
Yo-Yo Collecting as a Hobby FAQ
Glossary of terms (Transition, prototype, Mod, transaxle, etc.)
List of Yo-Yo Patents (PDF, updated 08/15)
by Rick Brough
References & Articles
Articles in PDF Format
PDFs of Books (out of print)
Resources - List of Articles and Books, in print and out.
2005-2017 © David W. Hall & Grahame Wright