Abstract: A hydraulic excavator (1) includes a vehicle body composed of a self-propelled lower traveling structure (2) and an upper revolving structure (3), and an operator's seat (9) provided on the upper revolving structure (3). The upper revolving structure (3) is provided with a fuel cell (11) generating power supplied to an electric motor (14), a hydrogen tank (20) storing hydrogen supplied to the fuel cell (11), a heat exchanger (24) cooling the fuel cell (11), and cooling fans (25C), (25D), (26A), (27A) each supplying a cooling air to the heat exchanger (24). The operator's seat (9) is disposed on the upstream side of the hydrogen tank (20) with respect to a flow direction of a cooling air F1 generated by the cooling fans (25C), (25D), (26A), (27A).

Abstract: A resin molded product whose main component consists of an ethylene-vinyl acetate copolymer resin and carbon black. The ethylene-vinyl acetate copolymer resin has an MFR of 0.5 g/10 min or more and 20 g/10 min or less. The carbon black has an average primary particle diameter of 55 nm or more and 100 nm or less and a DBP oil absorption amount of 100 mL/100 g or more and 300 mL/100 g or less. The content of vinyl acetate is 2.9 parts by mass or more and 12.3 parts by mass or less based on 100 parts by mass of the main component. The resin molded product has a surface resistivity of 720 ?/? or less.

Abstract: An acoustic output device includes a base case whose internal space is formed as an arrangement space and in which an insertion hole communicating with the internal space is formed, a cover that covers at least a part of the base case, an elastically deformable waterproof sheet including a flat surface portion joined to the base case and a bag-shaped pocket portion inserted into the insertion hole, a push button including an operating portion to be pressed and operated and a working portion inserted into the pocket portion, a substrate that is arranged in the arrangement space, and a switch that is arranged on the substrate and operated by the working portion via the pocket portion.

Abstract: An acoustic output device includes a base case whose internal space is formed as an arrangement space and in which an insertion hole communicating with the internal space is formed, a cover that covers at least a part of the base case, an elastically deformable waterproof sheet including a flat surface portion joined to the base case and a bag-shaped pocket portion inserted into the insertion hole, a push button including an operating portion to be pressed and operated and a working portion inserted into the pocket portion, a substrate that is arranged in the arrangement space, and a switch that is arranged on the substrate and operated by the working portion via the pocket portion.