17 Flexible Ducting for Fume Removal, Dust Collection, Ventilation and Air Conditioning and Hose Including Automotive Hose for Air Brakes, Fuel, Emission and Heaters, Jet Starter Hose and Miscellaneous Silicone and Rubber Aircraft Hoses, Air and Water Hoses of General Utility, and Friction Products and Materials-Namely, Clutch Facings and Friction Linings and Facings for General Utility and Purpose