John L. Hartstone

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Auckland, NZ

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Patents Grantslast 30 patents

Information Patent Grant
Metering arrangement
- Patent number 5,176,035
- Issue date Jan 5, 1993
- Tru-Test Corporation Limited
- John L. Hartstone
- G01 - MEASURING TESTING
Information Patent Grant
Metering arrangement
- Patent number 4,966,198
- Issue date Oct 30, 1990
- John L. Hartstone
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
Information Patent Grant
Bracket
- Patent number 4,098,479
- Issue date Jul 4, 1978
- Harstone; John, Lewis
- John Lewis Hartstone
- F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...