BWWN/31/4
"BSS, 1907"
Standards specifications:
"BSS for Cat Iron Pipes for Hydraulic Power"
"BSS for Charcoal Iron Lapwelded Boiler Tubes"
"BSS for Wrought Iron of Smithing Quality for Shipbuilding"
"BSS for Ingot Steel Forgings for Marine Purposes"
1907
BWWN/31/4
booklets