| A61M 39/00 | Tube connectors, tube couplings or branch units, specially adapted for medical use |
| B05B 1/20 | Perforated pipes |
| B63B 35/03 | Pipe-laying vessels |
| B64D 39/04 | Adaptation of hose constructions for refuelling aircraft during flight |
| B67D 7/38 | Arrangements of hoses in apparatus for transferring liquids, e.g. fuel, from bulk to vehicles or portable containers |
| E01D 19/10 | Fastening of pipes or cables to bridges |
| E03B | Water supply installations |
| E03D 11/17 | Means for connecting water-closet bowls to the flushing pipe |
| E03D 11/18 | Siphons for water-closets |
| E03F 3/04 | Pipes or fittings specially adapted to sewers |
| E04D 13/08 | Down pipes for roof drainage; Clamping means therefor |
| E04F 17/00 | Vertical ducts, channels in buildings, e.g. chimneys |
| E21F 1/04 | Air ducts for ventilation of mines or tunnels; Connections therefor |
| E21F 17/02 | Suspension devices for tubes or the like in mines or tunnels |
| F01N | Gas flow silencers or exhaust apparatus for machines or engines |
| F16N 21/00 | Conduits, junctions for lubrication systems |
| F17C 3/02 | Thermal insulation of vessels not under pressure for storing liquified or solidified gases, e.g. Dewar flask |
| F22B 37/10 | Water tubes of steam boilers |
| F23J 13/04 | Joints, connections for chimneys or flues |
| F24H 9/12 | Connecting circulation pipes to heaters |
| F28F 9/04 | Arrangements for sealing elements into header boxes or end plates of heat-exchangers |
| G21C 15/22 | Structural association of coolant tubes with headers or other pipes in nuclear reactors |
| H02G 3/04 | Protective tubing or conduits for electric cables |
| H02G 3/30 | Installations of electric cables or lines on walls, floors or ceilings——— |
| H02G 3/36 | Installations of electric cables or lines in walls, floors or ceilings——— |