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Patent applications and USPTO patent grants for Hemmings; David T..The latest application filed is for "root-strength drill bit and method of making".
Patent | Date |
---|---|
Root-strength drill bit and method of making Grant 5,353,552 - Hemmings October 11, 1 | 1994-10-11 |
Root-strength drill bit and method of making Grant 5,184,926 - Hemmings February 9, 1 | 1993-02-09 |
Multi-carrier drill bit container Grant 5,071,005 - Hemmings , et al. December 10, 1 | 1991-12-10 |
Drill bit carrying case Grant 4,598,822 - Hemmings July 8, 1 | 1986-07-08 |
Composite drill for drilling circuit boards Grant 4,135,847 - Hemmings January 23, 1 | 1979-01-23 |
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