TY  - BOOK
AU  - Indian Standards Institution
TI  - Technical Drawings - Simplified Representation of Centre Holes (IS : 11668 - 1985)
U1  - IS : 11668 - 1985 
PY  - 1987///
CY  - New Delhi
PB  - Indian Standards Institution
KW  - Indian Standard - IT
N1  - IS : 11668 - 1985
ER  -