3410 Structural steelwork (1) 3411 Structural steelwork (12) Fabrication and erection of structural steelwork either as the structural frame for the whole or part of a building or as general structural supports 3412 Steel minor structural members and supports (3) Minor structural members and supports of steel 3415 Architecturally exposed structural steelwork (0) Architecturally exposed structural steelwork 3419 Structural Steel Quality Control (0) Structural Steel Quality Control