Of course even before that HP mouse was created, there were those old tablet/pointer combinations with all kinds of menu's....Graftek, a Hanratty based Cad/Cam system was one of the first based on "Graftek" build dedicated terminals and running on Gould computer systems. Bet NO one here has ever seen a Gould system!
Before that there were "proof of concept" mice done by Xerox as they were the ones who really developed the "mouse/menu/icon" type interface Apple eventually ripped off. Also there was a company named Cimlinc who build a Sun architecture workstation back in the early 1980's who also used the Zerox "mouse/menu/icon" style interface on their own inhouse built workstations. They had the first "mouse" based user interface I ever saw..even before Apple.
The connection with Cimlinc/Sun/ and Zerox was the founder (Mike Sterling) was also "in" on those Darpa funded projects that also ended up spawning Sun micro systems..and Mike also had the rights to develop and sell hardware of the same architecture as those early Sun's ..and did so. His first systems were sold into the Manufacturing community with Cimlinc designed and built workstations, Monitors, Cad Software, Cam Software, and a bunch of other things. They sold well for a while including high profile companies such as Boeing and Carrier UTC and many others. Anyway....thats History now.