1. In preparation for studying and acquiring knowledge about miscellaneous compressed air system components (not covered in detail prior) access several websites sponsored by government agencies (either state or federal-DOE compressed air best practices), trade organizations (Compressed Air and Gas Institute, along with Compressed Air Challenge), and private companies (Ingersoll-Rand, etc). The companies can be in the business of manufacturing, designing and/or selling either systems or components, such as compressors, dryers, filters, tools, etc. Use key words in your search, especially, when the search continues below for finding information on components. After doing this search and study, list below the 3 sites you found to be the most useful