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Turboprops were developed after jets.

But yeah there were other reasons planes got much safer after around the 1950s.

In fact, turboprop (and turboshaft which is the same thing, but for applications other than fixed-wing aircraft propulsion) is jet engine designed such that it produces mainly mechanical power instead of thrust.

Most commercial airliners use turbofans which are similar in that majority of their thrust does not come from the engine's jet exhaust.

Turboprops were developed in the 20's

https://en.wikipedia.org/wiki/Turboprop#History

and used in popular prop airliners like the Lockheed Electra:

https://en.wikipedia.org/wiki/Lockheed_L-188_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.

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