Compact.
Call it Revelation, compact or Tri Star it's the same machine!
This is not one of the brands I know very well, but the Compact started out as 'Revelation' in the late 1940's. It was made by the Interstate Corporation out of Anahiem, California (Los Angeles area) and aside from a few minor changes, is bacically the same. Some collectors love it, some hate it, others, like me, really don't care that much either way. The general term for this is 'the Pig'.
What really put the Compact on the map was the tv quiz show Queen For A Day! I watched it so I could see the Compact dispay, as to the show it'self? it was awfull! But please don't get me started on that subject.
There were some very nice tools but I never understood the 'Magic Disk'! A sort of carpet sweeper thingy.
As for the history, I leave that to the experts in this club.
Alex Taber