Elyse M. Grasso scripsit:

> "Grinders" were also the normal usage in Connecticut (rhotic), at least
> through 1980.

What part of it?

The old boundary between non-rhotic east and rhotic west in New England
used to be the Connecticut River, but it's been moving sporadically
eastward for half a century.  Some lexemes like "grinders" may have
gotten left behind, or even spread westward.

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