It turns out that "Ritco" was a trademark first used in 1961 by the Emerson Electric Company for wrenches produced by their subsidiary, the Ridge Tool Company, better known for the Ridgid brand of pipe wrenches and plumber's tools. The Ritco brand was apparently targeted to the DIY market rather than to tradesmen.
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Technically, the trademark would have first been used by the Ridge Tool Company as Ridge was not acquired by Emerson until 1966...
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