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Some companies are using B2B techniques to squeeze more efficiency from the supply chain. Consider mechanics who work on GE aircraft engines, who typically spend hours studying a paper repair manual, cross-referencing it with update notices, thumbing through a parts catalog and phoning to leave a message for someone at GE who might call back the next day. Software from Enigma of Burlington, Mass., offers a fast alternative: the mechanic has only to find the part he needs, then click on it, and it's on the way. It's a greasy business, not particularly sexy. But it's a good example of how money is being made in B2B today.