Note(s) Attention is drawn to the notes preceding class Fulltext... Hierarchy... Expanded...F01, especially as regards the definition of the term "pump". This sub-class comprises: - non-positive-displacement pumps for liquids, for elastic fluids, or for liquids and elastic fluids, whether rotary or not having pure rotation.
- Combinations of non-positive-displacement pumps with other pumps are dealt with in sub-class Fulltext...
Hierarchy... Expanded...F04B, except that the use of such other pumps for priming or boosting non-positive-displacement pumps is dealt with in the present sub-class (Fulltext... Hierarchy... Expanded...F04D).
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