Other Uses
In the 1970s through the mid-1980s burglar alarms could (in some jurisdictions) be equipped with a tape dialer which would dial a number and repeat a recorded message when the alarm was tripped. Many of these tape dialers used the 4-track transport described here. They have been largely replaced with digital technology, e.g., Ademco SESCOA format dialer.
Read more about this topic: Stereo-Pak