Findings:
- Nuclear Rocket Propulsion
- Gravitophoton Field Propulsion
- Negative Mass Propulsion
- Jet propulsion
- MHD Propulsion
- nuclear fission fragment propulsion
- Jet Propulsion in Squids
- electromagnetic propulsion
- Mechanized Propulsion Systems
- Air Independent Propulsion
- Yoyodyne Propulsion Systems
- Gravitic propulsion
- Jet Propulsion Laboratory
- Continuum Distortion Propulsion
- propulsion
- hyperdrive
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