Zf641. This is a sound detecting device of the 60th Coastal Artillery Regiment in Fort Mills on Corregidor Island in the 1930s from The Riley McGarraugh Collection. Photo is courtesy of Glen Wiliford who holds the copyright to it.
Zf641. This is a sound detecting device of the 60th Coastal Artillery Regiment in Fort Mills on Corregidor Island in the 1930s from The Riley McGarraugh Collection. Photo is courtesy of Glen Wiliford who holds the copyright to it.