| 1/00 | Details, e.g. functional units (individual logic elements F15C; valves F16K) |
| 1/02 | Details, e.g. functional units (individual logic elements F15C; valves F16K) having at least one moving part, e.g. spool valve |
| 1/04 | Details, e.g. functional units (individual logic elements F15C; valves F16K) having at least one moving part, e.g. spool valve Adding; Subtracting |
| 1/06 | Details, e.g. functional units (individual logic elements F15C; valves F16K) having at least one moving part, e.g. spool valve Multiplying; Dividing |
| 1/08 | Details, e.g. functional units (individual logic elements F15C; valves F16K) having no moving parts |
| 1/10 | Details, e.g. functional units (individual logic elements F15C; valves F16K) having no moving parts Adding; Subtracting |
| 1/12 | Details, e.g. functional units (individual logic elements F15C; valves F16K) having no moving parts Multiplying; Dividing |
| 3/00 | Computing devices characterised by the interrelationship of the functional units and having at least one moving part |
| 5/00 | Computing devices characterised by the interrelationship of the functional units and having no moving parts |
| 7/00 | Computing devices characterised by the combination of hydraulic or pneumatic functional elements with at least one other type of functional element |