Construction of chemical, nuclear, power generation, petroleum, heat supply, steam and other plants; construction; advisory services relating to the construction of chemical, nuclear, power generation, petroleum, heat supply, steam and other plants; advisory services relating to the construction of buildings and other structures; repair or maintenance of chemical, nuclear, power generation, petroleum, heat supply, steam and other plants conducted based on fluctuating states of valves and other piping elements; repair or maintenance of other chemical, nuclear, power generation, petroleum, heat supply, steam and other plants; repair, replacement or maintenance of wire communication apparatuses and instruments or radio communication apparatuses and instruments for transmitting fluctuating state data of valves and other piping elements; repair, replacement or maintenance of other telecommunication apparatuses and instruments, other than telephone sets, radio receivers and television receivers; repair, replacement or maintenance of detectors for detecting fluctuating states of valves and other piping elements; repair, replacement or maintenance of other measuring devices; repair or maintenance of building equipment; repair, replacement or maintenance of computers and their peripherals, other electronic apparatuses and instruments.