I know that a Hustler MO-3 54" mast with something like a RM-20S resonator on top is officially an example of a center-loaded quarter-wave vertical...
... but Hustler also allows you to mount multiple resonators (say, a RM20 or RM20S + RM30 + RM40 or RM40S) by using their VP-1 bracket, which basically looks like a metal triangle whose ends are bent at an angle & have a hole centered within the bent ends for mounting up to 3 such resonators, and a hole in the middle to mount the whole assembly to the top of a mast (like the MO-3).
I'm scratching my head trying to figure out what you'd actually call that type of antenna, though.
On one hand, the coils might act kind of like traps... but then, that logically implies that it only acts like a single-band antenna for frequencies at or above the frequency of the highest band's resonator mounted to it. In other words, if you had resonators for 20m, 30m, and 40m mounted, 28MHz would see it as a single center-loaded quarter-wave vertical (because it would be blocked by the 30m and 40m resonators' coils), but wtf happens when you're transmitting on 7-10MHz?It seems like at 7mhz, you'd have RF dividing itself up among all three of the resonators (and their whips at the top) & end up with an antenna type that probably has a different name than merely "center-loaded quarter-wave vertical".
If it's not obvious, I'm seriously intrigued by the idea of combining multiple Hustler resonators on a mast via something like their VP-1 bracket. Given that these products have been around since before most of us were even born, someone has to have written about them, their design, and their theory of operation by now. If not a dissertation, maybe an article in QST or 73 magazine sometime in the 1970s or 1980s. But without knowing the proper name for an antenna that results from mounting two or more resonators above a shared mast, I'm searching for a needle in a haystack.
Some photos & a description of an antenna like this are at https://ab4bj.com/wordpress/2017/01/ab4bj-portable-antenna-system/