WKNR SIGNED OFF INTO HISTORY TODAY, APRIL 25, FORTY-YEARS AGO         DETROIT (April 25, 2012) — WKNR-AM, once the dominate radio station in Detroit during the 1960s, signed-off the 1310 AM frequency for the last time on this day, April 25, 1972.   Formerly WKMH-AM, the station made the switch to “the … Continue reading WHEN WKNR SIGNED OFF 40 YEARS AGO. THIS DAY ’72