The Gardener Roto Tiller from Gardening Naturally, Inc.

I am looking for information about a roto tiller manufactured by Gardening Naturally, Inc. from Stockbridge, MA.* It was purchased new by my husband's grandfather in the early 1980s.* We are trying to buy new tines for it. Is anyone familar with The Gardener Roto Tiller or this company.* If so, I would like contact information so we can get tines.

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Thanks.