westfw:
Printronix did make one the earliest 'dot matrix' printers in 132 column version. Dec also made an early 132 column dot matrix for their minicomputer systems, the famous LA-36 printer.
The Printronix I'm thinking of was a high-speed lineprinter replacement with an entire row (?) of dots.
The LA36 was a terminal (keyboard/etc), ran at 30cps, and had the more typical arrangement with a single column of dots on a moving printhead...LA36 Engineering manual: PDP-8 Document Search Results
Here is the picture of the Printronix I worked on a little, but don't recall the exact hammer arrangement, seem to recall something spinning pretty fast inside, but then again there were so many different printers back at the time.