Ha ha, you asked.
Long story short. I worked for most of my life in the design and manufacturing of consumer products and power tools. Our purchasing department decided to do a global search for drill chucks for hand drills no less. When manufacturing finally closed down I went on a tour through the old office and came across all these chucks. So rather than they go in the junk bin I snagged them.
It was only some time later that I realize that I had chucks that cost 10 times more than our drill alone, and just how awesome they really were.
David