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Top: Science: Technology: Mechanical_Engineering: Propulsion
This category is for sites that describe propulsion from an engineering standpoint generally, or which relate to more than one operating environment (land, sea, air, space). Specific types of propulsion are placed in subcategories according to operating environment.
Aerospace propulsion systems propel vehicles in air and/or space. Some such systems involve only air or space use, and each has a separate subcategory. This category holds websites which involve both, in some mixture.
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