STEEL BRIDGE STRUCTURES, STEEL EARTH STRUCTURES, AND STEEL WATER STRUCTURES-NAMELY, STEEL BRIDGE STRUCTURES OF ALL SYSTEMS [FOR RAILWAYS AND ROADS,] FIXED AND PORTABLE, FOOT BRIDGES FOR PEDESTRIANS AND WORKMEN; SHAFT FRAMEWORK; [HANGARS OF ALL SYSTEMS FOR PORT, MILITARY, AND CIVIL PURPOSES;] POLES FOR AERIAL POWER LINES OF ALL SYSTEMS, [LIGHTING MASTS,] ROOF TRUSSES, STAIRCASES, [WINDOWS, GATES, PILLARS; SLUICES OF ALL SYSTEMS, LOOK GATES, SHIP AND RAFT RAILWAYS, COMPLETE DOCKS AND DOCKS IN SECTIONS, SLIPS CONSISTING MAINLY OF WOODEN RAILS FOR LETTING SHIPS INTO THE WATER, BRIDGE-CONSTRUCTION PARTS]