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| More topics under "F03 - Machines or engines for liquids; Wind, spring, or weight motors; Producing mechanical power or a reactive propulsive thrust, not otherwise provided for" (135,960) |
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| F03B - Machines or engines for liquids (33,649) | | F03C - Positive-displacement engines driven by liquids (6,194) | | F03D - Wind motors (74,559) | | F03G - Spring, weight, inertia, or like motors; Mechanical-power-producing devices or mechanisms, not otherwise provided for or using energy sources not otherwise provided for (20,014) | | F03H - Producing a reactive propulsive thrust, not otherwise provided for (1,544) |
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