Robert Ritson Douglas

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Philadelphia, PA, US

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Patents Grantslast 30 patents

Information Patent Grant
Gas meter temperature compensating tangents
- Patent number 4,040,296
- Issue date Aug 9, 1977
- The Singer Company
- Robert Ritson Douglas
- G01 - MEASURING TESTING
Information Patent Grant
Three-chamber gas meter
- Patent number 4,014,212
- Issue date Mar 29, 1977
- The Singer Company
- Robert Ritson Douglas
- G01 - MEASURING TESTING