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Experimental research on the friction of pivots (1930)
NASA Technical Reports Server (NTRS) · leaf 56
• 566 Figs.6,7,ff. N,A*C#A. Technical Memorandum Diagram 1 … Fig.8 Diagram 1NASA Technical Reports Server (NTRS)
Internet Archive · NASA Technical Reports · Public domain (US government work). Free to use for anything.
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