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Not quite two paths as in branching - more sequential developments. Combo blades came first, followed by fluted discs used with combo blades.

G'day Gadge.
Mate, I haven't written much on this yet. It is a topic of some
interest. My argument will be that manufacturers started with
blade holders first. This is clearly the case with the 1932
Rotoscytrhe, where the blades gave no lift at all.

In AUS mowers, the holders of interest are from the 1957 Pope
and the-soon-to-be-discussed Collect-O-Matic. Supa-Swift, Turner and
Rover, on the other hand, opted for the combo blade as the solution.

Interesting topic though.
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Jack