Membership
Tour
Register
Log in
Fred W. Brackebusch
Follow
Person
Kellogg, ID, US
People
Overview
Industries
Organizations
People
Information
Impact
Patents Grants
last 30 patents
Information
Patent Grant
Narrow opening mechanical miner
Patent number
4,818,025
Issue date
Apr 4, 1989
Hecla Mining Company
Mandius C. Lundal
E21 - EARTH DRILLING MINING