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Kalvz tai-Hauvak was a 23rd century Klingon individual, a merchant and author.
In the year 2289, Kalvz contributed to Spacelanes magazine, authoring "The Imperial Way of Trade", an insider's look at Klingon trading practices. It was paired with a Federation perspective article by Gallagher Hansen called "Trade, Diplomacy, and the Klingon Empire". (FASA RPG module: Spacelanes: The Magazine of Interstellar Trade)