Looking for info on old knife & symbols on handle

The blade is 4 1/2 inches long, handle is 5 inches. I do know it is a Keen Kutter knife, but can't seem to find any info about the symbol that is on both sides of the knife at the top and bottom of the handle. My uncle did demolition and construction work in and around the Oakland California area in the 50's & 60's 70's and this was in his 'treasures' along with a lot of beautiful old doorknobs which I may post later. I am very curious about these symbols. Any info would be appreciated. Thanks!