Hradil; John Helmut
Patent Applications and Registrations
Patent applications and USPTO patent grants for Hradil; John Helmut.The latest application filed is for "diamond drill supporting apparatus".
- Hradil; John Helmut - North Delta CA
- Hradil; John Helmut - Delta British Columbia CA
| Patent | Date |
|---|---|
| Diamond drill supporting apparatus Grant 3,951,216 - Crawshay , et al. April 20, 1 | 1976-04-20 |
| Hydraulic Drive Apparatus For Wheeled Vehicle Grant 3,865,208 - Crawshay , et al. February 11, 1 | 1975-02-11 |
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