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Consists of 19 rolls of aluminum foil stacked within a split steel sleeve. Each roll contains continuous foil 600 feet long, 1/2 inch wide, and 0.0009 inch thick. One end of the foil is attached to a cardboard disc by a rayon leader 15 feet long, insuring streaming out of the foil roll. The foil rolls, with their cardboard discs, are each encased in a split retainer ring, forming a load unit. The units are separated by aluminum discs when loaded in the split steel sleeve.
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OP 1664, Volume 1 - US Explosive Ordnance (1947)