00 / 00 Interviewing Heinrich Gruber, John Heffernan and Howard Schomer ; part 2 BROADCAST: Apr. 4, 1964 | DURATION: 00:15:14 Details Broadcast Date Apr. 4, 1964 Physical Format 2 sound tape reels (ca. 50.20 min.): 7 in. Duration 15 minutes, 14 seconds Ownership The Chicago History Museum Tags Gruber, Heinrich. Hefferman, John. Schomer, Howard. Audiotapes. Radio programs WFMT (Radio station : Chicago, Ill.)