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"A grist mill is a grain mill that turns whole berries of grain or whole kernels of corn into meal or flour. At Kenyon's Grist Mill, we still grind in our vintage, 1886 grist mill and continue to use the original granite millstones quarried from Westerly, Rhode Island. These huge stones produce the exceptional texture and quality not found in modern, steel ground flours. ..."
From the website April 8, 2021
Kenyon's has been in business since 1696.