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- [5] ENERGY COSTS FOR HALL HEATING REDUCED BY UP TO 40-PERCENT WERKSTATTSTECHNIK ZEITSCHRIFT FUR INDUSTRIELLE FERTIGUNG, 1988, 78 (11): : 645 - 647
- [6] CUTTING COSTS BY 40-PERCENT WITH 4-AXIS NC TURNING MANUFACTURING ENGINEERING, 1979, 83 (05): : 80 - 81