Original sketch by Vint Cerf of a diagram of the "Internet, ca. 1977," which details the connection between the "PRNET," the "ARPANET," and the "SATNET," accomplished in black ballpoint on an off-white 3.5 x 2.5 card by Cerf, who signs below. In very fine condition. Encapsulated in a PSA/DNA authentication holder.
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