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The Mines of Haldar by Maurice G. Hugi:
Science Fiction Inventions, Technology and Ideas
"Amazing Story Of Inter-Planetary Adventure - Captured by the Skeleton Men of Mercury. Imprisoned in the Radium Mines of Haldar, Surrounded by Rocks that Radiate Death"

('The Mines of Haldar' by Maurice Hugi)
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an invention:
Electro-Telescope A device that could clearly image space battles and space ships, even from a great distance.
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