Abstract: An object of the present invention is to provide a monitoring system, a monitoring device, and a construction machine each capable of improving the convenience for a user during monitoring while ensuring security related to the leakage of video data of a peripheral region. In a monitoring system 10 of the present invention, a monitoring device 30 reads information related to an access ID from a first authentication-related information display portion 208 arranged outside an operator's cab of a construction machine 20, using a second camera 300, and also reads information related to an access password from a second authentication-related information display portion 210 arranged in the operator's cab, using the second camera 300. The access ID may include a combination of the identification number of the construction machine 20 and a code representing the type of the construction machine 20.

Abstract: The interconnection board includes a plurality of non-conductive insulation layers and through-holes running through the insulation layers. A plurality of conductive patterns are provided on each insulation layer, electrically insulated from each other, and exposed to the inside of one through-hole at the same axial position of the through-hole. The connection pin has a non-conductive stem and a connection pattern provided on the non-conductive stem. The connection pattern extends in the axial direction of the connection pin and electrically connects two conductive patterns provided on different insulation layers at the same circumferential position in the through-hole, by bringing the conductive patterns into contact at positions which are axially different and circumferentially the same.

Abstract: An alarm buzzer device for a bicycle, emergency call or the like, incorporates an electric power source, for instance, a dry cell therein. The device comprises a housing accomodating various elements, such as a buzzer element, stationary and movable contacts, and a lid for covering an open end of the housing and arranged floatingly relative to the housing by the movable contact, so that the device can be actuated by pressing any portion of the upper surface of the lid.