Abstract: A switch device includes a plurality of communication ports; a switch unit configured to relay a frame, which has been transmitted from a function unit and to which information including an ID of a VLAN is added, to another function unit via a communication port; and a duplication unit configured to, when the diagnosis device is connected to another switch device, duplicate the frame to be relayed via a designated communication port among the plurality of communication ports, and generate a duplicate frame for diagnosis that is a frame obtained by adding, to a duplicate frame obtained through the duplication, specific information indicating that the duplicate frame for diagnosis should be transmitted to the diagnosis device. The switch unit outputs the duplicate frame for diagnosis generated by the duplication unit from a communication port corresponding to the other switch device.

Abstract: The invention relates to a metal laminate gasket for use in an internal combustion engine, such as a cylinder head gasket. The gasket includes at least two metal plates, each having at least one hole to be sealed and a plurality of bolt holes. In one embodiment, the first metal plate includes an annular bead portion surrounding the at least one hole. The second metal plate is arranged to cover the recess of the bead portion of the first metal plate. A rigid synthetic resin layer fills a part of the recess of the bead portion of the first metal plate. The rigid synthetic resin layer serves to increase the thickness of the lamination of the gasket to enhance the sealing effect and serves to limit the degree of compression of the bead portion when the gasket is compressed. The rigid synthetic resin layer is covered with the first metal plate and the second metal plate, and thus does not come into direct contact with the joint surfaces.