I worked in MF Coventry for 34 years, believe me those above are not good...we used to pull apart most makes of agricultural farm machinery John Deere being on par with a Cov built MF unit, you get what you pay for I guess..
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And, no idea of the manufacturer, but this one was in fully working condition at a vineyard we visited (Carr Taylor) on a coach excursion from Eastbourne. https://flic.kr/p/2nkFRWN