... wind pipe, high strength cut teeth, engineering cut teeth, bullet head, wind, column teeth drill bit, mine, mine first ... production processing of private joint-stock Co., LTD, with shield construction in the subway, railways, highways, mine, water, ... , komatsu, Robbins, petrochemical, Hitachi, rickmansworth island with TBM shield machine etc. Hob, scraper can also according to customer special ...