"The Americans have need of the telephone, but we do not. We have plenty of messenger boys."
Sir William Preece, chief engineer, British Post Office ; 1878
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| Number | Title | Issue Date |
| 4227151 | Measurement and monitoring of the electrical conductivity of liquor samples A measuring cell for use in measuring and monitoring the electrical conductivity of a liquid. The cell comprises at least four concentric circular electrodes which are disposed in a flat or substantially flat surface. The concentric electrodes are mutuall... | 10/07/1980 |