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View full screenHeliograph or sun telegraph, invented by Sir Henry Mance, for long distance signalling, effective up to twenty miles, 1875
T.1885.102
Mance, Henry Christopher, Sir, 1840 - 1926, Inventor
United Kingdom, Northern Europe
1875
Inventor: Mance, Henry Christopher, Sir, 1840 - 1926
Communicate (08 Jul 2016)
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