Intelsat IV, 1975
The first Intelsat satellite of the fourth series was manufactured by Hughes Aircraft Company and launched on May 22 1975 from Cape Canaveral LC-36B on Atlas SLV-3D Centaur-D1A rocket by Convair Division of General Dynamics.
Wiki: https://en.wikipedia.org/wiki/Intelsat_IV_F-1
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