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"PRAFF." Fullformexpand.com, https://www.fullformexpand.com/praff/piston-ring-assembly-frictional-force. Accessed 12 Apr. 2026.
Fullformexpand.com, 2026. "PRAFF." Accessed April 12, 2026. https://www.fullformexpand.com/praff/piston-ring-assembly-frictional-force.
"PRAFF." (n.d.). Fullformexpand.com. Retrieved April 12, 2026, from https://www.fullformexpand.com/praff/piston-ring-assembly-frictional-force.
PRAFF. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/praff/piston-ring-assembly-frictional-force (Accessed: 12 April 2026).