TY  - GEN
ED  - Sri Lanka Standards Institution
TI  - SRI LANKA STANDARD 409 : 1977 Specification for Engineering Drawing Practice : Pt. I - general principles : Pt. 2 - dimensioning & tolerancing of size : Pt. 3 - geometrical tolerencing
PY  - 1977///
CY  - Colombo
PB  - SLS Institution
KW  - a744:621.71
KW  - SRI LANKA-STANDARDS
KW  - STANDARDS-SRI LANKA
KW  - ENGINEERING DRAWING
ER  -