Abstract: A transmission data controller determines a frequency bandwidth according to a relay apparatus position, the frequency bandwidth being used for a first signal transmitted from a first communication apparatus, on the basis of information regarding the number of first communication apparatuses with which a relay apparatus communicates at the relay apparatus position. The transmission data controller transmits band information indicating a frequency band selected from radio frequency bands that can be used for the first signal on the basis of the determined frequency bandwidth to the first communication apparatus. The first communication apparatus transmits the first signal having a frequency included in the frequency band indicated by the band information. The relay apparatus acquires waveform data of the first signal transmitted by the first communication apparatus, and transmits the acquired waveform data to a second communication apparatus by a second signal.

Abstract: A hanger device, including: a rod-like hanger for hanging headphones; a casing that supports the hanger such that the hanger is movable in its longitudinal direction between a storage position and a pull-out position; and a locking mechanism disposed between the casing and the hanger and configured to prohibit a movement of the hanger in the longitudinal direction when the hanger is located at the pull-out position.

Abstract: A protector for fixing a wire harness comprises a protector body having a chamber for accommodating the wire harness, a flexible band member one end of which is supported by one side wall of the protector body as a base end and the other end of which is a free end drawable inside the chamber, the flexible band including a first engaging member on the free end thereof, and a locking member provided on an inner face of the chamber, the locking member arranged so as to be able to lock the first engaging member of the band member which is wound on an outer periphery of the wire harness accommodated within the chamber.