distributorship services specializing in electronic parts and components and computer systems products; rescreening services to insure items meet manufacturer's specifications; value-added services, namely, the value added to or created in a product or commodity by the manufacturing or marketing process exclusive of the cost of materials, supplies, packaging and overhead product; new product testing, designing and programming services for others in the computer and electronics fields; technical consulting in the computer and electronics fields; retail store services in the field of electronic parts and components and computer systems products; specialized custom computer research and product development for others; telephone order services specializing in electronic parts and components and computer systems products.