📁 机械和工具
This category serves as a collection point for a host of sites put together by individuals, companies, and organizations that make, sell, service, or are otherwise concerned with the machinery, equipment, tooling, accessories, and consumables used by a wide range of industrial manufacturers. The category breaks the sites into groups that relate to either a main type of equipment or a particular field of industrial operation. Many of these groups are further broken down into subcategories that each assemble sites that have something in common with one another. An important point about all the sites is their focus on the equipment used in manufacturing an end product or achieving an end result. This is quite different from concern about the raw material involved in the manufacturing process. Sites of that sort belong in the relevant Resources industry categories. Note: Although over 5000 sites are distributed among the numerous subcategories that make up this Machinery and Tools section of the Open Directory, a relatively small percentage of them are indexed in five "above the line" categories: Associations, Directories, Employment, Technical Services, and Used Machinery. The focus in each case is on a general or all encompassing application to users of machinery and tools rather than on a narrower relationship to a specific industry or manufacturing process. Additional note: Several dozen sites are indexed, too, below the list of subcategories on this page. They represent companies that feature a diversified or out-of-the-ordinary range of products or services and are therefore difficult -- if not impossible -- to include elsewhere. A few of them do, at first glance, appear to have a relationship to a given subcategory, but the diversification of their interests and activities suggests that they are more justifiably listed under this "catch-all" heading.
