APPARATUSES AND MACHINES FOR USE IN UNDERGROUND EXCAVATION AND THE CONSTRUCTION OF TUNNELS AND MINES, NAMELY, HYDRAULICALLY OPERATED SUPPORTS AND HYDRAULIC CYLINDERS FOR USE IN TUNNEL CONSTRUCTION AND MINE CONSTRUCTION; HYDRAULIC MACHINERY FOR USE IN TUBBING OF MINE PITS FOR FACE SUPPORT FOR LONGWALL ADVANCING AND STATIONARY CONSTRUCTION AND FOR TRANSITIONAL CONSTRUCTION OF LONGWALL AND HEADING; STULLS, MINE PROPS AND ADJUSTABLE STRUTS AND SUPPORTS FOR USE IN TUBBING OF MINE PITS, FOR FACE SU...