Beskrivning : 2 covers with Houston post stamps and shuttle STS 41 D. In March 1981, Satellite Business Systems began delivering integrated voice, data, electronic mail, and video communications transmissions over the first all digital domestic commercial communications satellite system operating in the 14/12 GHz K-band. This fourth satellite, ordered in late 1981, was launched on the Shuttle on 30 August 1984.

USA 1919 - image retouchée ?

Sida : future · Ref: USA 1918 L

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Rymdhändelse :

STS 41 D (DISCOVERY) · TELSTAR 3C, SBS 4 & LEASAT 2 (SYNCOM 4 2) (SATELLITES)