A man stands in front of a building pressing a button on a radiotelephone.Photo caption: "A product truly ahead of its time, the DYNA-T.A.C. portable radiotelephone system, first demonstrated by Motorola in 1973, is similar to a normal dial…
Workers take a metalogical sampling at the #4 Basic Oxygen Furnace of Inland Steel in East Chicago, Indiana.On verso: "East Chicago, Indiana 1970; Basic Oxygen Furnace "BOF" metallurgists. Metallurgical sampling at the #4 B.O.F.; Astra DD…
A United States Mail parade float featuring two men in postal employee uniforms in front of a large mailbox appears in a parade in Chicago on behalf of the United States Postal Service.
Two women sit on top of a power shovel dipper while two men stand behind a horse-drawn wagon and its driver at the side of the dipper.Photo caption: "Largest all-manganese steel power shovel dipper ever made, 15 cubic yards 37 tons, shipped Feb.…