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   Thursday, February 2, 2023 11:21 AM     49115239 10 - medium carbon steel hardening.mp4
   Thursday, February 2, 2023 11:21 AM     19944935 11 - high carbon steel hardening.mp4
   Thursday, February 2, 2023 11:21 AM     68574346 12 - selection of materials.mp4
   Thursday, February 2, 2023 11:21 AM     48422636 7 - clasification of carbon steel.mp4
   Thursday, February 2, 2023 11:21 AM    175996360 8 - Low carbon steel hardening.mp4
   Thursday, February 2, 2023 11:21 AM     42743379 9 - Review carburizing and explain Nitriding.mp4