Back in the 50's Victa had 75% of the local market and exported to 22 countries.
Victa used their own engine , a disc shaped blade carrier and 4" long swing back blades.
So just about every one else did similar.
They tried twice to export to Amercia.
In the 70's the swing back blade was considered to dangerious for Amercians to use. It was OK in Germany, France, Sweeden & the UK
In the 80's they tried again with the vortex but it was "too quiet" and had to be modified to make it louder and have a visual indicator that the engine was running.
However I had always assumed the Honda's we got down here were the same as those you got over there but it would seem not