"Doc" was in his fifties when I met him. He was a very likeable guy with a most intriguing array of life experiences. He had graduated from the University of Chicago, served as a Captain in the Army Airborne, and at one time, had even made false teeth for a living. He had a definite ability in the sphere of art. Not only could he make false teeth, but he could engrave as well. Of course, the Treasury Department didn't appreciate his talents when they discovered a trunk load of homemade $20 bills! That added one more experience to his most unusual life - prison.
Doc knew just about everything. If he hadn't done it himself, he knew firsthand someone who had. This was not just idle talk either. He really had been around. Consequently, he always showed us better ways to mine coal.