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Is there any company selling rocket engines that work for small and medium orbital launchers other than Ursa Major Technologies?

Looks like a good model: the company developing a rocket can save a lot of time and money not having to spend for devoping their own engines.

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A major example is NPO Energomash, developing and selling engines to several Russian an American launch vehicles.

As an example of small launcher, the company delivered the first stage engine of the Korean Naro-1 rocket.

As a larger example, it delivers the RD-180 which powers the first stage of the Atlas V.

Saving time and money was the deciding factor for Orbital Sciences Corporation to buy NK-33 an later RD-181 engines for the Antares from NPO Energomash, rather than developing a new high-performance kerolox engine.

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Meanwhile I found:

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