TY  - BOOK
ED  - British Standards Institution
TI  - Definitions for use in mechanical engineering: difinitions relating to construction drawing practice size & tolerance timits & fip serew threds surface textrue & ganges
U1  - B.S,2517 
PY  - 1954///
CY  - London
PB  - BSI
N1  - B.S.2517:1954
ER  -