7931 Travelling cradles (0) Travelling cradles, suspended by cables from overhead runway beams or cranes, with or without vertical or sloping guides and/or restraints, moving horizontally and vertically on the external faces of a building or in internal spaces and atria, to carry persons 7932 Horizontally travelling cradles (0) Travelling cradles, suspended from overhead runway beams, travelling horizontally across internal and external faces of a building on a monorail system, to carry persons 7933 Overhead travelling cranes (0) Overhead travelling crane systems for the transport of goods, including providing the electrical supply from a designated point of supply but not including the supporting building structure nor the rails on which it runs 7934 Static cranes (0) Static crane or hoist systems for the hoisting of goods, including providing the electrical supply from a designated point of supply but not including the supporting building structure 7935 Monorail systems (0) Monorail systems, either manually or electrically operated, for hoisting and transporting goods, including providing the electrical supply from a designated point of supply where so required, but not including the supporting beam 7936 Hoists and winches (0) Manually or electrically operated hoists and winches, including vacuum devices, installed on runway beams or fixed in position 7937 Weighing devices (0) Weighing devices, fixed to the building structure including flush mounted floor scales and remote indication and recording 7938 Access safety systems (77) Permanent safety access systems required for routine maintenance and servicing activities on buildings