This working apparatus for a component or a board includes a head unit and a control portion. The water-contact instrument includes valves for city water, feedwater or hot water, pipe joints, strainers, water faucet clasps, pump supplies materials, water meters, water purifiers, water feeders, hot water feeders or other such water-contact instruments each made of copper alloy, such as bronze, brass, etc. For each respective modulator, the phase of the respective signal is different.