As far as I know Mountfield were the importers/distributors of Murray mowers in the 1980’s. As others may recall weren’t Mountfield and Murray mowers also available in DIY stores like B&Q?
From past research I have done there does appear to have been a lot of horticultural machinery manufacturers in Ohio and surroundings. For instance there was the Quick Manufacturing Inc of Springfield (makers of the US sold Springfield mower) that also sold their machines in Europe but redbadged with another makers livery and logos.