スイングヤーダ集材における繊維ロープ使用による労働強度軽減と生産コスト低減の実証 (特集 平成22年度「革新的施業技術等取組支援事業」)  [in Japanese] Both the reduction of labor strength loading logging-workers and the decrease of log-production cost, had been established by the practical use of fiber ropes in the log-yarding operation under a swing-yarder being able to change the machine-direction  [in Japanese]