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As you see telcos use glass fiber cables [P1130375a]
SeppoU [Read 'About' for info!]:
P9240409
SeppoU [Read 'About' for info!]:
Artifical 1 [P9240216b2]
SeppoU [Read 'About' for info!]:
Artifical 2 [P9240216d]
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P9240628