Processes for separating carbon monoxide from a hydrogen chloride-containing gas, which comprise reacting the carbon monoxide with chlorine to form phosgene and then optionally separating the phosgene from the hydrogen chloride-containing gas. The brush assembly is removably mounted to the head assembly. At least one of the two identifiers may be provided to a wireless service provider. The phase difference among outputs from the inverter units occurring in the parallel operation of the inverter units is reduced by changing the output frequencies of the inverter units.