Subeam was..
A fantastically powerful vacuum, Im sure its out there, but it may take a while to find, the reason there are not many left is, they were too powerful for the bag, any fine dust and the bags would explode,ruining the motor if not properly cleaned, when the Dual Deluxe came out in 58 it was downrated because it drew 12 amps, overloading many of the older homes wiring, but it, along with the Apex Strato Cleaner had the most airflow and sealed suction of anything on the market, about twice the airflow of an Electrolux,even more suction than a Compact or Filter Queen, the secret was a very fast one fan motor with very little restriction, the fans in both machines were shaped like flying saucers, thicker in the middle thin at the edges, this caused a compression effect creating power the likes of which has not been seen in many machines, even today, you can get a machine with more sealed suction now, but hardly anything moves as much air.
