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So don't worry so much about how to use  had had  as a unit of grammar, they will come together naturally when you want to express the verb ' to have ' in the past perfect. Let's consider a different verb for a moment like  to want .
February 4, 2011. JT TEN appearing on a stock certificate indicates there are joint owners of the stock represented by this certificate. Joint tenancy is often used by certificate owners who are married or have other familial relations -- such as father/son or brother/sister -- establishing equal rights for both parties in this stock ownership.