Artifacts
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Artifact
A cesium clock like this was tested on the NTS-2 satellite to see if clocks could keep accurate time in space.
Artifact
This atomic clock was built for the first GPS satellites in the late 1970s.
Artifact
This represents the first commercially available chip-size atomic clock.
Artifact
The DAGR was an improvement on the PLGR, providing map data in a lighter hand-held device.
Artifact
Roy Bardole used this touch-screen computer and an antenna (not shown) to receive enhanced GPS signals for working corn and soybean acreage in Iowa.