PATENT 34531 of 1989 - Part Two
The patent for walk-behind mowers is significant - in that these subtle
but clever patents were incorporated and remain to this day (2017).
The Greenfield walk-behinds are, arguably, the best residential
lawnmowers made in this country ...

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[Linked Image]
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http://greenfield.com.au/mower/walk-behind/

TO BE CONTINUED ...