Gruenewald; Bryan J.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Gruenewald; Bryan J..The latest application filed is for "apparatus for developing quickness in swinging of a baseball bat".
- Gruenewald; Bryan J. - San Diego CA
| Patent | Date |
|---|---|
| Apparatus For Developing Quickness In Swinging Of A Baseball Bat Grant 3,809,397 - Gruenewald May 7, 1 | 1974-05-07 |
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