Show PATENTS RECENTLY ISSUED prepared for the mining review by davis davis patent attorneys washington quartz mill samuel C arnold denver colorado ore crusher charles 0 omaha nebraska apparatus for extracting copper vera A brewer los angeles cal dry concentrates jos B jardine jr san francisco cal ore concentrating I 1 belt T R brooks oakland cal ore treatment thos J lovett chicago ill E B H mcguire and A al mcguire los angeles cal centrifugal al impact pulverizing apparatus D 0 marks denver colorado metal reinforced concrete timbering for mine tunnels D AV shepard denver colo |