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Invention, innovation, and economic evolution - ScienceDirect

Jun 01, 1983· Prevention of rhesus hemolytic disease 1961 1967 TABLE 2 Distribution of Major Technical Inventions, 1850-1970, by Number of Inventions per Year, Number of Major Inventions Number of Years per Year Observed Theoretical 0 81 81.02 1 27 25.9 2 7 9 3 + _6 5.01 Totals 121 120.9 ,,mean (m) = 0.51, exponent (k) = 0.85, X = 0.78, P = 0.40.

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LED’s are directional light sources (kind of like weak lasers), so LED bulbs didn’t give off the same omnidirectional glow that incandescents do. And early attempts to replicate Edison bulbs with LEDs were crazy expensive and looked like Doctor Who’s robot arch enemies the Daleks.

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