Abstract: A master device that is a fixed device belongs to any of a plurality of areas, and includes: a notification information generation unit that generates notification information including position information of a plurality of fixed devices installed in the area to which the fixed device belongs; and a communication unit that transmits a notification signal including the notification information to a mobile device at a timing different from a timing of transmission of the notification signal from another area, the mobile device being configured to estimate a position based on the notification information.

Abstract: A bending resistant part of an endless multilayer fabric for densifying paper materials is placed on a trimming part; to thereby prevent cutting of a fabric at the trimming part. Also oblique movement and dropping off a guide protrusion is prevented. Particularly, a bending resistant part is formed by filling a polyurethane resin in internal structure of an endless fabric of trimming part of the width direction of the fabric woven with arranging at least three layers of weft. A guide protrusion molded from similar polyurethane is arranged on the bending resistant part by fusion. Cutting caused by bending and wearing of the fabric near the guide protrusion is prevented.