Goodell-Pratt did make some combination squares. The quality is just a hair below the Starrett's. Goodell-Pratt eventually was bought by Millers Falls and their tool line was moved over.
Below is a Goodell-Pratt set. Non-reversable.
Goodell-Pratt 1.jpg
Next is a lower cost Handyman (no level or scribe)
Goodell-Pratt 2.jpg
And a Fulton (Made in USA) that appears to have been made by Goodell-Pratt for Sears that I nickel plated.
Fulton 1.jpg
Union Manufacuring made a set too. Non-reversable. While this is a 9" set it uses the standard 1" wide blade, so a 12" will work.
Union 1.jpg
Another quality one is by Mitutoyo. This one is reversable.
Mitutoyo Protractor 1.jpgMitutoyo Protractor 2.jpg
Part 5 will cover other similar tools and will conclude this series.