Original World War 2 industrial propaganda magazine vintage ad for AIR REDUCTION of New York City, NY. A Quick Trim for a Metal Giant. Mammoth ingots of steel for war weapons must be cropped or trimmed at the ends before forging. Now a new heavy cutting technique developed by Airco Research Engineers using the oxyacetylene flame trims off both ends at once in just 11 minutes. Old 1943 WW2 era advertisement.