BS 1139-2.1-1991 Metal Scaffolding. Couplers. Specification for Steel Couplers, Loose Spigots and Base-plates for Use in Working Scaffolds and Falsework
BS 1139-2.1-1991 Metal Scaffolding. Couplers. Specification for Steel Couplers, Loose Spigots and Base-plates for Use in Working Scaffolds and Falsewo...