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Tests of oil scraper piston ring and piston fitted with oil drain holes (1922)
NASA Technical Reports Server (NTRS) · leaf 11
Detail of modified piston - Liberty 13 low corrroression Bore 5" Stroke 7" Material lynite Weight of piston (no rings) 3.156 lb. Fis. 1.NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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