Daryl,
I see one very obsolete, maybe one that is salvageable, and two that are junk. Not totally junk, you could rebuild them with a good hand at TIG welding with some high yield rod. Then set up on compound tilt rotary table and recut the pocket. Looks like a stripped out screw hole in one, easy fix with a Helicoil insert. The one with all of the chipped inserts, may have stuck screws that the socket has been stripped out. May take a carbide drill or endmill to drill out and clean the threads out. Probably another Helicoil insert. Who knows. This is the kind of things you may run into buying used face mills at auction including evilbay. My brother and I used to do repairs on large 8"-10" facemills for the company he worked for back home. Made good money on them, too, back in the days.