Dynapac develops ‘first of its kind’ electric tandem roller (Dynapac, 동종 최초 전기 탠덤 롤러 개발) Compaction equipment manufacturer Dynapac has developed a “first of its kind” electric tandem roller, as part of its new Z.ERA initiative to eliminate emissions. The CC900e electric double-drum vibratory roller, which is currently being field-tested in Sweden, weighs 1.6 tonnes and has an operating drum widt..