[1] Secondary Surveillance Radar
[2] Solid State Recorder (Cassini, NASA/JPL)
[3] Solid State Relay
[4] Subsynchronous Resonance (->"IEEE Standard Dictionary")
[5] Specification Status Report (Westinghouse) (->"IEEE Standard Dictionary")
[6] Station Set Requirements (->"NASA Acronym List")
[7] System Requirements Review (->"NASA Acronym List")