I remember these!
These machines were indeed designed by Panasonic, and sold under the Kenmore brand. They were available in the early-to-mid 2000's, and were actually (in terms of price and features), close to Kenmore's bottom-of-the-line (this one may be the BOL bagged Kenmore upright from its time). For the price, they were great. This one had a bagless sibling as well, which was one of the better bagless options at the time. I found them to be quite good (but I preferred the bagged version). Lightweight, good agitation, decent on-board tools, and quieter than similar offerings. Overall, it was a cheapened version of the basic Panasonic upright, but they still held up well.