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by Harry Dalek » Fri Sep 02, 2016 9:07 pm
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.
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Harry Dalek
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by DrZarkov » Sat Sep 03, 2016 4:55 pm
Never heard about that. Usually the disc-record with lateral cut is said to be invented by Emile Berliner. Berliner got a patent on his system in 1887.
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DrZarkov
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