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Relive Pearl Harbor - Hour by Hour: December 7,  7 a.m.

Picture of a plane On the northeast coast of Oahu, two army privates finish up duty at a mobile radar station. Just as they are about to turn off their radar screens, a huge "blip" appears. The privates immediately recognize the blip as a large group of aircraft, which appear to be only 130 miles out to sea and closing fast on Oahu!

The privates try phoning the air warning center in Honolulu, but at first the lines are dead. When they finally get through, the lieutenant who takes the call dismisses their worries. He says that the blip is a squadron of American B-17 bombers returning from the mainland.

Radar - an instrument used by planes and ships to find solid objects by reflecting radio waves off them and by receiving the reflected waves.

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