Original: It was introduced and used primarily during the Kamakura (1192–1333), Nanbokucho (1334–1392) and early Muromachi (1392–1573) periods.
Simplified: It was introduced and used primarily during the Kamakura (1192 - 1333), Nanbokucho (1334 - 1392) and early Muromachi (1392 – 1573) periods.