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" Edison's invention was practically made when he ascertained tlie theretofore unknown fact that carbon would stand high temperature, even when very attenuated, if operated in a high vacuum, without the phenomenon of disintegration. This fact he utilized... "
Edison: his life and inventions - Page 862
by Frank Lewis Dyer, Thomas Commerford Martin - 1910
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Decisions of the Commissioner of Patents and of the United States Courts in ...

United States. Patent Office - Patent laws and legislation - 1893
...the glass. Edison's invention was practically made when he ascertained the heretofore unknown i'act that carbon would stand high' temperature, even when...attenuated, if operated in a high vacuum, without the l^icnomenon of disintegration. This fact he utilized by the means which he lids described a lamp...
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The Federal Reporter, Volume 54

Law reports, digests, etc - 1893
...elements combined for the purpose set forth in the patent; that these structures embodied the conception that carbon would stand high temperature, even when...high vacuum without the phenomenon of disintegration. He finds these particular lamps are not now in a condition to be operated, but he is satisfied that...
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