1) Beginning of the 10th century 2) Can manufacturers institute 3) Early 10th-century date 4) Early 10th-century year 5) LIII x XVII 6) Roman 901 7) Start of the 10th century 8) Tenth-century starter 9) XVII x LIII Found on https://www.crosswordclues.com/clue/cmi
Coded mark inversion. ITU-T line coding technique specified for STS-3c transmissions. Also used in DS-1 systems. Found on https://www.encyclo.co.uk/local/22803