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Author: WikiMatrix
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English[en]
In September 1970, they announced they had made single-mode fibers with attenuation at the 633-nanometer helium-neon line below 20 dB/km.
Galician[gl]
En setembro de 1970, anunciaron que fixeran fibras monomodo cunha atenuación na lonxitude de onda de 633 nm da liña helio-neón por baixo de 20 dB/km.