Assembly of a magnifying lens and holder for phones, cell phones, pagers, GPS and personal data assistance devices
   
   

 
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< Method and apparatus for GPS signal receiving that employs a frequency-division-multiplexed phased array communication mechanism

< Position location of multiple transponding platforms and users using two-way ranging as a calibration reference for GPS

> Avoiding interference to a GPS receiver from wireless transmissions by time multiplexing GPS reception

> Apparatus for improved integrity of wide area differential satellite navigation systems
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