Explanatory notes
… of the edge. Tubing of this type may be rendered water or gas tight by packing with rubber, asbestos, textiles, etc. … vacuum cleaner tubing; conduits for compressed air, steam, gas, water, petrol, oil or other fluids in engines, … flexible transmission piping, rubber tubing, etc. (2) Corrugated flexible tubing obtained, e.g., by deformation of …