TY - BOOK AU - Bureau of Indian Standards TI - Technical Drawings Abbreviations and Symbols for Use in Technical Drawings (IS : 11670 - 1993) U1 - IS : 11670 - 1993 PY - 1993/// CY - New Delhi PB - Bureau of Indian Standards KW - Indian Standard - IT N1 - IS : 11670 - 1993 ER -