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On the eastern bank, the Israelis are deeply entrenched in shellproof bunkers on the 95-mile Bar-Lev Line.

Ponderous shellproof bunkers, with antiaircraft, anti-tank and machine guns, have been built near Berlin's Zoo station, in the Friedrichshain workers' district, in the Lichtenberg factory area.

Its presiding genius, handsome, abstemious Dr. Harry L. Frevert, lives from one ballistic test to the next, his only concern the race between armor-piercing shells and shellproof armor.