Huh. Mirtone shows up as a fire prevention hardware company. Wonder if it was some kind of smoke/heat detection equipment.

Also shows up an an intercom plug. Did anyone else ever have a house intercom? We just hollered a lot

[img]https://i.imgflip.com/6f8cnj.jpg[/img]
This has bothered me for almost 2 years now. My apartment has this weird round plug around the corner of the kitchen. Similar size to a large stereo plug. Anyone know what it might be?