Some of the graphics tablet-designing companies rarely sell them under their own names, but instead let other companies rebrand and sell them. Two examples are UC-Logic and Waltop. Rebranded models have essentially the same hardware, but different logos on them and sometimes slightly different cases. There are many companies selling rebranded tablets and they rarely reveal the original designer and model name, so there are more such tablets still to be found.
Identifying original model
The USB vendor and product ID identify original tablet model. However, very often, tablet identity could be guessed with high probability, by comparing appearance and specifications.
Most of the "sold as" models listed on the Tablet support status page and individual tablet pages have been guessed that way. Such models have "guess" mark after their name. If someone confirms the guess, the mark is removed. If the guess is disproved, the tablet is removed from the "sold as" list and then, if the correct original model becomes known, added to the appropriate one.