I remember Central Vac being a VERY big deal in the 1960s and 70s. We lived in West Central Wisconsin then, and there was a Mom and Pop type "Home Center" (anything and everything for the home, lumber, ect, kinda like a large hardware store) in the town that sold and installed Beam Central Vac.
Many of the homes and especially the larger homes in the town, built at that time were equipped with Central Vac.
I remember that the hoses that most everyone had at the time were a brownish dark beige,,and came with a Preco Power Brush, along with the Eureka style attachments, floor nozzle,extra wide floor nozzle, ect.
A neighbor several houses down from ours had a very large home with a large Beam unit in the garage. I could always tell whenever they were using it, even with their garage doors closed,,you could easily hear the very loud whine of that motor. Was just a kid then, so Of course id go knock on their door and ask if they needed any help vacuuming!
Over 35 yrs later, i went back to that neighborhood, and drove by that house, the garage doors were up, and that same exact Beam Unit was still there in the garage where it always was.