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did nasa invent gps
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did nasa invent gps, did nasa create the gps, did nasa develop gps, gps was developed by nasa, was gps was originally developed by nasa, did nasa help make gps, invention of the gps, how was gps invention patented, the fascinating history of gps invention, gps was invented in, how was gps invented and developed, who actually invented gps, whose invention is used in gps systems, how was gps invented for navigation