STB 1553-2005 Prefixes ferroconcrete for support of communication lines and the electricity transmission the voltage 0.38 kV and from 6 up to 10 kV. Specifications
2005STB 1553-2005 Prefixes ferroconcrete for support of communication lines and the electricity transmission the voltage 0.38 kV and from 6 up to 10 kV. Specifications