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The Manpack was one of the first portable GPS receivers for combat troops.
Quartz oscillator used to control radio frequency on Transit satellites.
Set in an electrical circuit, a crystal resonator vibrates regularly and becomes an oscillator to control radio frequencies.
NASA planned to place the Ranger 1 satellite into an elliptical orbit around Earth, but it never reaching its intended orbit.
Ranger 3 lunar probe, launched January 26, 1962.
Replica of Ranger 7 lunar probe made from parts of test vehicles. Replica is on display in the National Air and Space Museum.
A corn and soybean farmer from Rippey, Iowa.
Farmer Roy Bardole, seated in his office, views an agricultural GPS image on his computer monitor while field maps are laid out on his desk.
Farmer Roy Bardole seated at the controls of his combine in a cornfield on farm in Iowa. A GPS guidance system display is mounted at the top center on right side of cab.
This atomic clock was built for the first GPS satellites in the late 1970s.