I have some old Derbyshire catalogs and paper.
On Sept. 30, 1957, they were located at 157 High St., Waltham 54, Mass. The president was Jessie A. Derbyshire and the Vice-President was Shaw B. Smith. They were still calling their collets wire chucks in the 1957 catalog.
A 1965 catalog has the address at 265 Bear Hill Road, Waltham, Mass. 02154. They used the term wire collet instead of wire chuck.
In 2007, they were at 910 Boston Turnpike, Shrewsbury, MA 01545.
The current address is 38 Main St., Blackstone, MA 01504. That is barely across the border from RI and the building is across the road from the Blackstone River. That river flows south to Pawtucket, RI and powered the Slater Mill and David Wilkinson's machine shop. The last time I contacted Derbyshire, I dealt with a Mr. Smith.
Derbyshire has some web sites, but it looks like they did not spend much money on them.
F.W. Derbyshire Inc.
Derbyshire Precision Lathes Since 1911
F.W. Derbyshire Inc.
Larry