A power working machine has a machine body, a drive source mounted on the machine body for driving a work implement connected to the machine body, and an operating handle mounted on the machine body for undergoing rotation relative to the machine body. A space is formed inside a core member. The second elastic element includes two second spaced plates and a second connecting element for connecting the two second spaced plates. The watermark encoding system has a converter to convert an audio signal into frequency and phase components and a mask processor to determine a hearing threshold for corresponding frequency components. Moreover, the invention relates to uses of such molecules, including, transforming soybean cyst nematode resistant soybean with constructs containing nucleic acid molecules from regions the soybean genome, which are associated with soybean cyst nematode resistance.