PATENT 78865 of 1981
Theo appears to have started the new decade with a new mower design.
The main patented features were the cutter deck and engagement mechanism.

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This would become the production Greenfield 5XL & 8XL ride-on.

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SOURCE: Geoff Nowak Flikr Photostream.

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Attachments
patent_78865_81.pdf (1.23 MB, 8 downloads)
PATENT 78865 of 1981 Greenfield 8XL Ride-on Lawnmower