Derek Plummer

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Burton-on-Trent, EN

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Patents Grantslast 30 patents

Information Patent Grant
Mine equipment
- Patent number 4,095,434
- Issue date Jun 20, 1978
- Coal Industry (Patents) Limited
- Rodney James Anthony Hunter
- E21 - EARTH DRILLING MINING
Information Patent Grant
Rock excavating arched tunnel forming machine
- Patent number 3,979,151
- Issue date Sep 7, 1976
- Coal Industry (Patents) Limited
- Derek Plummer
- E21 - EARTH DRILLING MINING