Yahoo (NSDQ: YHOO) has made a strategic investment in Info Network Management Company (INMAC), a phone directory search company based in Chennai that offers online and voice-powered directory assistance. Yahoo bought a 30 percent stake in INMAC, known for its Call Ezee service, and will gain at least one spot on the board. There’s also a revenue-sharing component, though IDG says financial specifics were not disclosed. The two companies will integrate their business lists, giving users of Yahoo Local and other properties more in-depth listings of local companies and services; additional projects may follow.