Ten Assorted DuMont Slot Keyway 10 Broach Bushings + Generic + 1/2" & 7/16 Shims

Description

Here are ten assorted sizes of DuMont Greenfield and generic slot keyway broach bushings, plus three 1/2"-D and one 7/16-3 shims.
Some of the bushings are collared as shown in the photos.  Please note sizes based on the tape measure.
The longest shim is about 6 1/4".  Please note the wear on the shims.
I can try to answer questions but am not knowledgeable on the ways of the machinist!
The items came from a working environment and are in the condition shown.
Thanks for looking!