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• 2009-06-17 05:07 Materialscientist 703×186× (18365 bytes) {{Information |Description = Silicon nitride thruster. Left: Mounted in test stand. Right: Being tested with H₂/O₂ propellants |Source = http://www.grc.nasa.gov/WWW/RT/RT1999/5000/5130eckel.html |Date = |Aut