Electrolux copied the concept (NOT the actual design) when the patent expired. This would have been with the model LX.

The salesmen used to have a clear plastic demo plate to put over the cloth bag. Pressing the switch on the inside of the bag cover would start the machine and stuff inside the bag would swirl.

works only on particles with sufficient mass to be picked up and spun. Very light particles require very high-force cyclonic action to acquire sufficient mass so as to drop out of the air stream, cyclonic separation. Particles too heavy to be spun can be sucked up, but create resistance in the cyclone.  Fine dust will adhere to the walls of the bag due to static electricity.  Rice will help to slow down the drop in airflow, but it is not a linear relationship. A 10% reduction in airflow equates to approximately a 30% reduction in pickup power. The engineers at Electrolux showed me a quadratic equation that resulted in a parabolic graph. Suction and airflow are inter-related. The style C bag actually increases in suction until the first 25% of the bags capacity is filled. As the airflow drops off, suction increases in relative, not absolute terms, in an inverse square relationship. All of this is based upon standardized test dirt and standardized medium length, medium density plush carpet.

The dirt in the bag only has to be compressed a tiny fraction of an inch to allow air to slip past. Thus the bags can be packed like sugar and the machine still have some cleaning power.

The peculiar looking Tri-Star-esque vacuum is a never-sold machine called a Sun-Storm, presumably to compete with the Air-Storm.  There were many, many prototypes from the Old Greenwich plant that were simply junked. An article in a Lux magazine in 1973-74 featured pictures of many prototypes that were never produced for sale. Very, very cool looking, some of them. As a branch manager with connections to the factory I asked about these lost designs, the response: (shrug) "probably junked"