TY - CONF AU - Jun-Feng Song AU - Samuel Low AU - Xiaoyu Zheng C2 - Proceedings of 4th International Symposium on Precision Mechanical Measurements (ISPMM 2008), Hefei, -1 DA - 2008-08-25 LA - en PB - Proceedings of 4th International Symposium on Precision Mechanical Measurements (ISPMM 2008), Hefei, -1 PY - 2008 TI - NIST Microform Calibration System for Rockwell Hardness Standardization ER -