Keywords: Lot-9434-1: A sound locator is shown, the “ears” of a U.S. anti-aircraft post. The device is used to detect the approach of enemy planes. The soldiers are learning how to use it. Office of War Information Photograph, April 22-28, 1942. (2016/01/08). Lot-9434-1: A sound locator is shown, the “ears” of a U.S. anti-aircraft post. The device is used to detect the approach of enemy planes. The soldiers are learning how to use it. Office of War Information Photograph, April 22-28, 1942. (2016/01/08). |