Ametek's "Novatone NT2" Horn

This alarm I came across a while back, it’s called the “Novatone NT2”, made by a company called “Ametek”:

Looks just like a Federal Signal Vibratone doesn’t it? In fact, the grille design is pretty much identical to a B2 Vibratone, except for the lines being curved more. It also doesn’t have the secondary set of “lines” that a Vibratone does. According to what I’ve read this alarm is usually used for general signaling applications, hence the gray color. (though there are also black versions) Do you suppose Federal Signal had anything to do with the manufacture of this alarm? (or at least allowed Ametek to use a modified version of the grille design since Federal owns a patent on the Vibratone’s grille design)
It doesn’t sound ANYTHING like the Vibratone though. Craig Baker made a video demonstrating the tones: (yes it’s actually an electronic horn rather than mechanical like the Vibratone is)
NT2-24DF Testing - YouTube

Sound likes 8 bit sound effects. Mega man.

I own an Ametek HSD (pretty much a Federal 450 horn)