Threaded holes on back of PM-1022V Bed casting

Pfeffa

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What is the purpose of the pair of threaded holes on the back of the PM-1022V bed casting?

They are near the middle of the bed ~125 mm apart (horizontally) and appear to be threaded M10-1.5, and there is a square patch around each which is not painted like the rest of the casting.
My guess is that there once was a milling attachment for some model of lathe that uses this casting, like in the Grizzly Combination Lathe-Mills (but they don't have a 10x22 version of these).

Has anyone made use of them?

[Apologies if this has been covered, my due diligence search yielded nothing.]
 
Some portion of a Taper cutting attachment point?
 
Most likely a milling attachment. Here is the PM 1022's cousin:
Is the mill not attached to the cross feed saddle so that it can be moved along the lathe's z axis (along the bed). I think that @Pfeffa said the holes were in the back of the lathe bed... so a fixed position? Or maybe I do not understand how the mill is attached and moves.
 
Mill is fixed. X and y table are the lathe cross slide. I purchased a Weiss 11x27 with mill and sold off the mill portion as I have a standalone mill.
 
Mill fixed. Workpieces mounted on carriage, and it helps if cross slide is flat with two or more T-slots, but it's not nearly as capable as a real
milling machine
Emco-Maier did some of the best ones with the Super 11 and 13 series, and I think even the Compact 8 and 10 had the feature
 
Correction: there are four holes in the Bed casting - the upper two were concealed by the carriage scale for the DRO - vertical spacing ~33 mm C-C.
 
See attached pic:
 

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