You are correct, I must have quickly scanned the post and thought it was two names you gave but it is the same person.Dawn Wells or Mary Ann
Dawn Wells.
Her agent at the time was also her husband and he negotiated a better contract for her.
The producers never thought that the show would go into endless re-runs and and gave residual rights to anyone that asked for it. Dawn Wells was the only one that had it in the contract to receive residuals
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