1. Ernst H. The Use of Patent Data for Technological Forecasting: The Diffusion of CNC-Technology in the Machine Tool Industry. Small Bus Econ. 1997;
2. Lim J, Kim DY, Kim S. An experimental study for quality assurance of free-form concrete panels produced by CNC machine. J Civ Eng Manag. 2018;
3. Patil M. Literature Review for Designing of Portable CNC Machine. IJIRST-International J Innov Res Sci Technol. 2017;
4. Zhou Z De, Gui L, Tan YG, Liu MY, Liu Y, Li RY. Actualities and Development of Heavy-Duty CNC Machine Tool Thermal Error Monitoring Technology. Chinese Journal of Mechanical Engineering (English Edition). 2017.
5. Su S, Hu Y, Wang C. The key technology research about 3D CNC bending machine and experimental verification. J Coast Res. 2015;
6. Li XH, Li WY. The Research on Intelligent Monitoring Technology of NC Machining Process. In: Procedia CIRP. 2016.
7. Sonawane AR, Rane AB, Sudhakar DSS. DEVELOPMENT OF A3-AXIS CNC MILLING MACHINE WITH AN OPEN SOURCE CONTROLLER. Int J Res Eng Technol. 2017;

SOEIT, Sanskriti University, Mathura, Uttar Pradesh, India (sushil.me@sanskriti.edu.in)