Inventor

HAMPEL DAVID A

3 patents

Patents

3 patents

US4335532AJun 22, 1982

Excavating tooth

ESCO CORP138 citations93

US4404760ASep 20, 1983

Excavating tooth

ESCO CORP143 citations91

US4454205AJun 12, 1984

Method of drill bit manufacture and product

ESCO CORP2 citations55