Despite such opposition, the first meters were installed by the Dual Parking Meter Company beginning in July 1935; they cost a nickel an hour, and were placed at 20-foot intervals along the curb that corresponded to spaces painted on the pavement.
The single solution for everything in your air. Many air cleaning systems filter out particles. Some combat germs, and some fight odors. But only the PureAirâ¢ Air Purification System addresses all three types of indoor air pollutants.
The air detector may be considered to be an automatic device that operates during each cycle of operation that will provide additional assurance that an excess of air (and/or non-condensable gases) does not remain at the end of the air removal stage in sufficient quantities to affect the sterilization process.ts purpose is to automatically check the process at the end of the air removal stage, and before the heating stage, to ensure that an adequate amount of air has been removed to prevent the sterilization being affected.