Derry; David G.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Derry; David G..The latest application filed is for "apparatus for playing a ball game".
- Derry; David G. - Wadebridge Cornwall GB2
| Patent | Date |
|---|---|
| Apparatus for playing a ball game Grant 4,991,844 - Derry February 12, 1 | 1991-02-12 |
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