Thanks for attaching the PDF there Gadge.
Regarding the final state of the edger, I'd agree it must have had quite a few design amendments after the patent was first lodged.
As for further information about what those amendments were, I've heard so many conflicting stories that it's difficult to separate fact from fiction. Some say blueprints exist, some say none were ever produced, some say anywhere from 1 to 250 were made but never sold. I know that a few enthusiasts have attempted to make their own, with one example clearly based on the patent design.
I may be able to shed further light on the topic down the track - fingers crossed.
