I can answer a couple of these
Cleva's a Chinese company (with an American subsidiary). I've heard the Titan canisters, which they do make, are (or at least were) rebadged Panasonics (and that they used those existing designs when Panasonic got out of the vacuum market and Cleva replaced them as the Kenmore OEM) but I'm not sure who designs their new ones, like this one and the Kenmore Elite uprights from the last generation of Sears models (that are now sold all over the internet).
According to their website they make vacuums under license for a few other US brands—like they produce little ArmorAll-branded wet-dry vacs, etc. Based on their global website it seems like wet-dry vacs were actually their original stock in trade, but I've mostly heard very good things about the Kenmore vacuums they produced for Sears (specifically the 31140/31150).
This one looks nice. It's cool to see someone try to bring bags to "modern" vacuum designs and calling them out as a feature rather than a bug.