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Turboprops were developed in the 20's

and used in popular prop airliners like the Lockheed Electra:

I'm guessing you're thinking of turbofans.

The Electra flew after the Comet.

and the DC-3 and Boeing 247 and 307 before the Comet.

I don't know why you're arguing we had jet airliners before propliners. In general, props greatly predate jetliners for civil aviation.

The DC-3 wasn't (originally) a turboprop.