The Voice-O-Graph was a do-it-yourself recording studio the size of a small closet. Walk inside, close the door, deposit 35 cents and make a record of your own. The machines cranked out a lacquer-coated disc that held about a minute of crackling sound. It was first created in the late 1930s and used until the late 1950s. Soldiers and loved ones could send their own voices in place of a written letter during World War II.