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| Picture No | 10091687 |
| Date | 1939 |
| Description | MEASURING INTERFERENCE |
| Details |
The Post office is responsible for all telecommunications ; one of its tasks is to measure interference with radio signals
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| Source | Cigarette card, Lambert & Butler series, 'Interesting sidelights on the work of the General Post Office' |
| Credit | Mary Evans Picture Library |
| Restrictions |
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