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The Federation communications earpiece
The cell/mobile phone was not the only aspect of Trek communications technology that made it to reality.
The wireless earpiece, which both communications officer Lt. Uhura and science officer Spock were known to have used on a number of occasions on the show, also became a reality as the Bluetooth Headset, which is also a Motorola innovation.
Motorola Mobility was purchased by Google in August 2011.