[paulx]

Would appreciate help in identifying some old tool holders (shown in photo below--or attached if either method works). Some 14 of these were found in our shop. We had recently given away an old Cincinnati Acramatic 220 so that might have been where they were used. We don't use anything like this.

Markings on some of these holders show patent 2960343 (granted in 1960), and part numbers of the form “T-301-D”. Any ideas as to what these are and who might be interested in them? Thanks, Paul