This shot isn't of much help but I think the one at the top in a previous shot may be the one in the bottom left corner of the box they came in (from Charlie Parker). It certainly appears to be reverse tapered, and was probably threaded on the shank end, but I don't see pulling it with a Morse taper fitted rod, as that would have possibly pulled from the spindle.
Perhaps the current custodian, who I won't name until he jumps in, could look them over in more detail. I just don't remember the details I failed to recognize, at the time, as important. The only thing I'm certain of is where they came from, and who made them, so have no doubt where they were employed.
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Threaded Mode