37 CONSTRUCTION OF WELLPOINT SYSTEMS, WATER SUPPLY SYSTEMS, SEWAGE SYSTEMS, SEWAGE TREATMENT SYSTEMS, DEWATERING SYSTEMS, EDUCTOR SYSTEMS, WELL SYSTEMS, SOIL STABILIZATION SYSTEMS, SEWAGE DISPOSAL SYSTEMS, VACUUM AND ELECTROOSMOSIS SYSTEMS, WASTE WATER TREATMENT SYSTEMS, AND INDUSTRIAL WASTE TREATMENT SYSTEMS TO THE ORDER AND/OR SPECIFICATION OF OTHERS; AND RENTAL AND/OR MAINTENANCE OF WELL-POINT EQUIPMENT, WATER SUPPLY EQUIPMENT, INDUSTRIAL WASTE AND SEWAGE TREATMENT EQUIPMENT, JET PUMPS, WATER PUMPS, ELECTRICAL GENERATORS EQUIPMENT, AND VACUUM AND ELECTROOSMOSIS EQUIPMENT