Sentence:  In summary, the record establishes that to produce <WSD>horsefeathers</WSD> one starts by sawing a log (longitudinally) into boards or planks, which are then likewise center resawn (longitudinally); that the original boards, as well as the center resawn boards, have at least two approximately parallel longitudinal sawed surfaces; that the resawn boards are simply resawn again longitudinally at an angle or bevel to produce <WSD>horsefeathers</WSD>; and that the only other sawing required is the crosscutting of the boards to length. 
Meaning of the word marked with <WSD> tags:  Feathering strips.