Apollo Lunar Module Descent Engine (LMDE) Pintle Injector Sleeve Assembly developed by TRW, measuring 8.75" long and 6.75" in diameter, labeled on the side: "QR 108505-3 03, S/N Q133." The LMDE's pintle injector was the first implementation of throttleable coaxial injector technology, allowing the LM Pilot to vary output of the LMDE in order to regulate the spacecraft's descent rate down to the moon's surface; the technology was subsequently adopted by Space-X for its Merlin Rocket Engine.
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