- AeroPac's
http://www.aeropac.org/
"Association of Experimental Rocketry of the Pacific" organizes regular high power rocket launches in Northern California and Nevada.
- RRS
http://www.rrs.org
The Reaction Research Society is the oldest continuously operating amateur experimental rocket group in the United States.
- Swiss Propulsion Laboratory
http://www.spl.ch/
SPL develops propulsion elements for sounding rockets like LOX valves, injectors, regeneratively cooled combustions chambers, igniters, propellant feeding systems and thrust test stands.
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