7 Machines and machine tools for the laying, maintenance and repair of cables, pipes and conduits; agricultural tools and machines, namely, laying ploughs, cable ploughs, spider ploughs, and crawlers; construction machines and apparatus, namely, laying ploughs, cable ploughs, spider ploughs, and crawlers; ploughs, in particular pipe or cable ploughs for the underground laying of cables, pipes or conduits; apparatus and machines for laying and ground boring, in particular ram drilling machines, earth moving machines, ram boring machines, steerable dry or wet drilling machines, rope winches; machines for sludge draining; parts and fittings for the aforesaid goods, included in this class, namely, soil opening devices, ripper shoes for machines, blades for machines, laying shoes for machines, soil tillage equipment for machines