The 64047 PU was a four blade stockman pattern with round bolsters and 3-7/8" closed length. Discontinued in the late 70's.
There was also a four blade junior cattle pattern, the 64055 P, made in the early years and discontinued in the 1940's.
Four blade "hobo" the 6452 and 3452 made in the Tested era.
Four blade "bartender" the 84062 K made in the Tested era.
Four blade equal end pen knife 5460 made in the Tested era.
I can't think of any more off the top of my head in the older knives other than congress and scouts.
Many multi blade SFO's have been produced since the 90's. I just saw some 4blade muskrat patterns at the Shepher Hills table at the Case get together in Bradford, and there have been others including trapper and peanut patterns.