Vacuum Test of Pratt & Whitney RL-10 Engine
Lead Test Engineer John Kobak (to the right) and a technician use an oscilloscope to test the installation of an RL-10 engine in the PSL No. 2 on 13 April 1962.
Image Credit: NASA/Paul Riedel
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https://www.nasa.gov/image-detail/grc-1962-c-60072-2/
Image CreditNASA/Paul Riedel
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