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Can you give the precise name of this rocket component is, and its role?
#ArianeGrouppic.twitter.com/UsPr0HLdPS
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Hum... Most difficult. What part ? Part of a motor, on the top of main combustion chamber. What motor ? Very hard... Vulcain ?
The hint is how it seems to have been produced. That's the best clue you can use to differentiate them. 
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Additive manufacturing ? Indeed, it seems to be monolithic, not an assembly of some parts...
Prometheus ? -
We're using additive manufacturing for other products as well, not only Prometheus. (Although Prometheus almost gets the 100% treatment)
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