" I continued on Robin Hill Rd to Kate's Corner (almost 22 years in this town and I still have no clue who Kate was), "
I grew up in Chelmsford (1967-1990-ish). I remember it as Phil's Market. Rode by it every day going to Byam School.
Here's more than you wanted to know about the store
https://chelmhist.org/FunFactFiles/1824Kate'sCorner.htm