I've been trying to do some research on old emergency equipment and cars used by the Minneapolis police department and while doing so I watched 6 season 3 episode of cops all with 1990 air dates where they were in Minneapolis, throughout the episodes any time a siren was used (which of course they did not use studio sirens ever on cops) it was always this specific one but I have no clue what so ever as to what it is called, go to between Minute 21 second 21 and Minute 21 second 28 in this video to get a listen to it
, I've never heard the siren before but I am quite curious about it if anyone knows more.