Derek J. Frost

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North Brickhill, GB

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Patents Grantslast 30 patents

Information Patent Grant
Dibber drills
- Patent number 4,989,524
- Issue date Feb 5, 1991
- National Research Development Corporation
- Frank R. Brown
- A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING
Information Patent Grant
Rotor assemblies
- Patent number 4,900,292
- Issue date Feb 13, 1990
- National Research Development Corporation
- Paul S. Berry
- A01 - AGRICULTURE FORESTRY ANIMAL HUSBANDRY HUNTING TRAPPING FISHING