I know some manufacturers jumped on the bandwagon making these things. They were probably the pre-cursor to todays "multi tool". I might have to find and re-size and post some of the loony patents people came up with. Every concievable combination. I ran across one that had a knife, corkscrew, screwdriver and saw attached to one of those spiked "kaiser" helmets... It would be great to see real examples, if they ever actually got made.
Who knows which way the wind may blow around here!
It's a trick to get you to buy two of them. Don't fall for it.