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Small mystery arbours, strange taper size, help identify?

M. Moore

Titanium
Joined
Jun 8, 2007
Location
Vancouver Island, B.C. Canada
I forgot where these came from and have no idea what machine they fit.
Before I list them on the sale forum I would appreciate if anyone can identify them for me.

The taper is approx .875 at the large end and about .640 at the small end. A search for that size taper had no results. The thread measures at 9/16-12.

There is a 7/8” stub arbor and a very small 1/2” shell mill holder and a combo straight/45° X 1/4” square boring tool.
 

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