| More topics under "F04 - Positive-displacement machines for liquids; Pumps for liquids or elastic fluids" (390,498) |
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| F04B - Positive-displacement machines for liquids; Pumps (160,476) |
| F04C - Rotary-piston, or oscillating-piston, positive-displacement machines for liquids; Rotary-piston, or oscillating-piston, positive-displacement pumps (83,008) |
| F04D - Non-positive-displacement pumps (138,150) |
| F04F - Pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped; Siphons (8,864) |