BS1139 ke tlhaloso e tloaelehileng ea Brithani bakeng sa lisebelisoa tse tloaelehileng le likarolo tse sebelisoang ho aha. E fana ka litlhokahalo tsa litlhokahalo, tse le bang, liboto le ho netefatsa litsamaiso tsa Scaful ho netefatsa hore polokeho, boleng le boits'oaro. Ho latela melao ea BS1139 ho bohlokoa ho boloka botšepehi le polokeho ea scafadding ho libaka tsa kaho.
Nako ea poso: Mots'eanong 22-2024