37 Chemical cleaning of and passivation of pipe, tubing, components, tanks, hoses, and fittings in the pharmaceutical, semiconductor, and aerospace fields; precision cleaning of pipes, tubing, components, tanks, hoses and fittings in the aerospace, military, pararmaceutical, microelectronics and industrial fields; repair and cleaning of valves, pressure gauges, and components; oxygen cleaning of tubing, valves, vessels, sensors, and pressure gauges; precision cleaning of valves, pressure gauges, transducers assemblies, bellows, and components of all sizes in the semiconductor, aerospace, military, and pharmaceutical fields; cleanroom space rental; custom construction of temporary cleanrooms for others; on-site precision cleaning of piping systems of all sizes and materials, components, vessels and containers; providing mobile cleanrooms for temporary use by others; cleaning of cryogenic, hypergolic, breathing air, medical gas and other gas systems; precision cleaning and passivation of breathing apparatus, namely high pressure tubing, hyperbaric chambers, vessels of various sizes, pressure gauges, regulators, valves, high pressure control stations and complex environmental control systems for for divers and astronauts; boiler chemical cleaning; pipeline flow improvement services; and pipeline pigging and cleaning services