Kraeuter wasn't the only company making this style of vintage Combination pliers with asymmetrical jaws, BHM did, too. Note that one jaw is straight with serrations, while the other is curved with serrations. The outer profile is curved because the jaw is. You can see my BHM "Matchless" brand example, along with a catalog excerpt explaining their utility, in post #48 on page 2 of the mega 'Pliers' thread, which can be found under P for pliers in the A-Z Index of threads contained in the Sticky at the top of the forum titled 'READ B4 POSTING'.