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http://palathully.com/2018/06/%e0%b4%af%e0%b5%82-%e0%b4%8e%e0%b4%b8%e0%b5%8d-%e0%b4%89%e0%b4%aa%e0%b4%97%e0%b5%8d%e0%b4%b0%e0%b4%b9-%e0%b4%97%e0%b4%a4%e0%b4%bf-%e0%b4%a8%e0%b4%bf%e0%b5%bc%e0%b4%a3%e0%b4%af-%e0%b4%b8%e0%b4%82/
യൂ എസ് ഉപഗ്രഹ ഗതി നിർണയ സംവിധാനം – G P S -Global Positioning System