| 1/00 | Acetylene gas generators with dropwise, gravity, non-automatic water feed |
| 1/02 | Acetylene gas generators with dropwise, gravity, non-automatic water feed Valves |
| 1/04 | Acetylene gas generators with dropwise, gravity, non-automatic water feed Valves Screw valves |
| 1/06 | Acetylene gas generators with dropwise, gravity, non-automatic water feed Valves Cocks |
| 1/08 | Acetylene gas generators with dropwise, gravity, non-automatic water feed Other means for controlling the water feed |
| 1/10 | Acetylene gas generators with dropwise, gravity, non-automatic water feed Water feed from above through a central or lateral pipe |
| 1/12 | Acetylene gas generators with dropwise, gravity, non-automatic water feed Water feed from above through porous materials |
| 3/00 | Acetylene gas generators with automatic water feed regulation by means independent of the gas-holder |
| 3/02 | Acetylene gas generators with automatic water feed regulation by means independent of the gas-holder with membranes |
| 3/04 | Acetylene gas generators with automatic water feed regulation by means independent of the gas-holder with floats |
| 3/06 | Acetylene gas generators with automatic water feed regulation by means independent of the gas-holder with pistons |
| 5/00 | Acetylene gas generators with automatic water feed regulation by the gas-holder |
| 5/02 | Acetylene gas generators with automatic water feed regulation by the gas-holder with overflow for the water |
| 5/04 | Acetylene gas generators with automatic water feed regulation by the gas-holder by drop-by-drop water valves connected with the gas-holder |
| 5/06 | Acetylene gas generators with automatic water feed regulation by the gas-holder by drop-by-drop water valves connected with the gas-holder by drop-by-drop water cocks connected with the gas-holder |
| 5/08 | Acetylene gas generators with automatic water feed regulation by the gas-holder with gas-holder-connected water valves or cocks according to the submersion system |
| 7/00 | Acetylene gas generators with water feed by Kipp's principle |
| 7/02 | Acetylene gas generators with water feed by Kipp's principle with water feed from below |
| 7/04 | Acetylene gas generators with water feed by Kipp's principle with water feed from above |
| 9/00 | Acetylene gas generators according to Dobereiner's principle with fixed carbide bell |