hybrid hybrid surface treatment surface treatment analysis material die forging hot durability wear reduction research methodology review paper literature review increasing tool life wear tool life hot forging die hot forging research paper research application of spring mass system computational methods for mechanical engineering modelling spring mass mathematical modelling mathematical modelling spring damped system forced damping free damping damped system damped spring mass system mass spring formula for calculating intersection point algorithm for clipping line segment viewing transformation sutherland-cohen clipping algorithm bit code method clipping algorithm window to viewport tranformation window and view port viewport computer graphics window transformation window clipping cad
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