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| CPC | COOPERATIVE PATENT CLASSIFICATION |
| | DIGITAL FLUID-PRESSURE COMPUTING DEVICES NOTE - | This subclass includes all devices in which at least one computing function is performed by hydraulic or pneumatic means |
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| G06D 1/00 | Details, e.g. functional units (individual logic elements F15C; valves F16K) |
| G06D 1/02 | . | having at least one moving part, e.g. spool valve |
| G06D 3/00 | Computing devices characterised by the interrelationship of the functional units and having at least one moving part |
| G06D 5/00 | Computing devices characterised by the interrelationship of the functional units and having no moving parts |
| G06D 7/00 | Computing devices characterised by the combination of hydraulic or pneumatic functional elements with at least one other type of functional element |