NASA electric discharge machine, c. 1967. Full caption: "ELECTRIC DISCHARGE MACHINES WITH TURBINE BLADE AND ROCKET ENGINE AT THE TECHNICAL SERVICES BUILDING TSB"
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Previously:
Electrical discharge drilling machine - video
Odd-shaped plunge EDM electrode - photo
1910 lathe tools - photo
1952 NACA heat transfer test section and rig - photo
1956 NACA magnaflux inspection - photo
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