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AVIATION development, stimulated already to a considerable extent by radio and the invention of instruments which make it possible to fly without being able to see the earth, is impeded to some extent by the lack of lighting appliances which supply sufficient illumination for effecting emergency landings with safety, or for landing on aerodromes in the ordinary course of air traffic, or for reconnoitring of the region over which a flight is being made.
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© MCB UP Limited
1929
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