G'day Max,
Thanks again.

Yes, I think Francis could have found a better patent attorney.

The development of the cutting blade and blade holder are fascinating,
and AUS makers went down different design paths.

This stepped blade design was certainly used by Supa-swift
as early as 1959. How Supa-swift may have also introduced
an early example of the stepped and fluted blade (for catching).

I also guess the bracket to prevent straightening of the
blade proved un-necessary with the advent of pressed
spring steel in manufacture.

[Linked Image]

Cheers
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Jack