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2. “Non-productive Time in Conventional Metal Cutting,” Report #3;Fridrikson,1979
3. “Machining Data Handbook,” Vol s. 1 & 2, Metcut Research Associates Inc., 3rd Edition, 1980.
4. “AM Cost Estimator, Edition”;Ostwald,1985
5. “The Utilization of Machine Tools,”;Tinker,1968