Ohio Boxboard Company Trivia
From the City of Rittman, Ohio's homepage:
The discovery of salt deposits in Rittman in 1897 led to the founding of Wayne Salt, which later became Ohio Salt. In 1948, Ohio Salt became Morton Salt - today one of Rittman's major employers. E.J. Young, who started the salt company, needed a way to package both his salt and his matches, which were made in nearby Wadsworth. Young formed the Ohio Boxboard Co. in 1903. That company became a major employer also, bringing to town many new employees and helping business grow. Ohio Boxboard was acquired by Packaging Corporation of America (PCA) in 1965, then Rittman Paperboard, boasting of over 1200 employees at it's prime. Sadly, Rittman Paperboard closed it's doors in early 2006.
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I'm unsure whether the Ohio Box Company manufactured all the Kirby cabinets/attachment cases, because I looked on the Classic III case for the manufacturer's certification stamp on the outside and couldn't locate it. That makes me wonder if Kirby produced its own cases after the Sanitronic era.