Business-to-business transactions and large corporate accounts are commonplace for firms in manufacturing. Samsung, for example, is one of Apple's largest suppliers in the production of the iPhone. Apple also holds B2B relationships with firms like Intel, Panasonic and semiconductor producer Micron Technology.B2B transactions are also the backbone of the automobile industry. Many vehicle components are manufactured independently, and auto manufacturers purchase these parts to assemble automobiles. Tires, batteries, electronics, hoses and door locks, for example, are usually manufactured by various companies and sold directly to automobile manufacturers.Service providers also engage in B2B transactions. Companies specializing in property management, housekeeping, and industrial cleanup, for example, often sell these services exclusively to other businesses, rather than individual consumers.