Kadant Inc. has completed its previously announced acquisition of Key Knife, Inc. and some of its affiliates for approximately $156 million in cash, subject to certain customary adjustments. The acquisition was financed primarily through borrowings under Kadant’s revolving credit facility. Key Knife, a global supplier of engineered knife systems for custom chipping, planing, and flaking solutions for wood product industries, is headquartered in Tualatin, Ore. with…