An earlier example of a Lawn Mower Barrow Attachment was invented by Herbert Malcolm Mcneill, from Whanganui, New Zealand.
A patent was filed on the 5th March 1919, NZ patent number 41389 granted and published on the 4th September 1919.
A USA patent was filed on the 23rd Sept 1919 and patent number US1338144A granted on the 27th April 1920.

Again, do we know how successful they were and do any examples still exist ?

cheers
Alan

Attachments
Lawn Mower Barrow Attachment.jpg (223.95 KB, 43 downloads)