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SRI LANKA STANDARD 409 : 1977 Specification for Engineering Drawing Practice : Pt. I - general principles : Pt. 2 - dimensioning & tolerancing of size : Pt. 3 - geometrical tolerencing - Colombo SLS Institution 1977 - various paging


a744:621.71
SRI LANKA-STANDARDS
STANDARDS-SRI LANKA
ENGINEERING DRAWING

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