Can't boot Mountain Lion installer on a machine that already has Mavericks installed

I have upgraded my Mac mini 2012 to Mavericks, and everything is running quite well.  However, I need to also run Mountain Lion (a piece of hardware I need to use is not Mavericks compatible.)
I am attempting to install Mountain Lion on a 2nd partition on my Mini's internal hard drive by following the following steps:
* used Disk Utility to repartition my mini's internal drive, creating a 100 GB partition to install Mountain Lion on
* used DiskMakerX to create a Mountain Lion bootable USB key
* rebooted machine while holding down Option
At this point the boot menu appears and I see icons for both my Mavericks partition, as well as the Mountain Lion installer USB key.  However when I select the USB key and try to boot from it, it does not boot; instead I get a gray screen with the universal "no" symbol (circle with a slash through it) on it.
I tested the USB key on another Mac and it booted fine, so there is nothing wrong with the USB key I made.  So it would seem that the Mountain Lion installer will refuse to run on a computer if it has a newer OS on it, even if the computer has a free partition (or drive) to install on to.
Is there any way around this restriction?

Hi,
to calm your nerves: on my computer I have CS3 and CS4, and I work with both versions, but of course, I never use them at the same time. First, I had CS3, CS4 I installed later.
All the keyboard short cuts, like yours work free from defects.
Hahns-G.

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