STU-I

The STU-I, like its successors sometimes known as a "stew phone", was a secure telephone developed by the U.S. National Security Agency for use by senior U.S. government officials in the 1970s.

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STU-I secure telephone desk set. Electronics were housed in a separate cabinet.
STU-I cabinet with desk set on top. The person talking is U.N. Ambassador Andrew Young , calling from New York City during the Israel-Egypt peace talks in the Carter administration .
STU-I cabinet front door open.