New York--Electronics e-marketplace PartMiner.com continues to land the big ones. The company, which last year cut a pioneering exchange-to-exchange deal with e2open.com, on Monday signed a three-year deal with Dell Computer Corp. to help the computer giant source hard-to-find parts. In addition, Dell Ventures made an undisclosed equity investment in PartMiner. Dell's sourcing and procurement departments--already backed by a first-rate private e-marketplace--will use PartMiner's public marketplace services in instances when its primary suppliers are unable to meet unplanned demand. Dell, along with Cisco Systems Inc. and Wal-Mart Stores Inc., has long been cited as an example of a company large and savvy enough to build its own procurement e-marketplace, rather than depending on independent market-makers or industry consortia. Its deal with PartMiner, more than anything, demonstrates it believes it can even further fine-tune its already well-tweaked supply chain.