TANK BLOCKS. . . Tank blocks. Anti-tank blocks - ingeniously cast in ladles from a mixture of slag and iron . PILL BOXES. With the passage of time it is estimated that less than 6,000 of a total of 28,000 pillboxes built still survive. . . WWll Pill box. In WW2 anti air guns were used to shot down planes, but their original name is Anti - aircraft guns. .
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