SLS 702 ; 1985 : Specification for electrical call bells and buzzers for indoor use.
- Colombo SLSI 1985
- 08 p.
STD2885
SLS 702
a643.62
SRI LANKA-STNADARDS
STANDARDS-SRI LANKA
STD2885
SLS 702
a643.62
SRI LANKA-STNADARDS
STANDARDS-SRI LANKA