9 Flow Tester; Testing Tubes, Testing Tapes, Samplers and Monitors for Measuring, Warning and Analyzing Gases, Vapors and Noxious Substances; Dust Samplers; Aeronautical Oxygen Respirators; Diving Apparatus-Namely, Diving Suits, Gas Supply Units, Diving Simulators, Diving Telephones, Diving Cylinders, Portable or Stationary Decompression Chambers, Underwater Stations; Respirators Operating Independently of or in Dependence on the Ambient Atmosphere-Namely, Self Contained Respirators, Air Line Respirators, Regenerative Respirators, Canister Respirators, Respirators with Oxygen Releasing Substances, Filters, Flexible Tube Connections, Containers; Protective Face Masks for Protection Against Gas, Spray, Fumes or Radioactive Dust; Protective Suits for Industry-Namely, Suits for Protection Against Gases, Sprays, Fumes or Radioactive Dust; Protective Helmets and Protective Anti-Gas Goggles; Air and Gas Supply Units for Respiratory Protection; Gas Testing Units; Respirators for Patients During Transportation; Humidifiers for Respiration; and Electric Power Transformers