Group of four business cards, each 3.5 x 2, signed in ink of felt tip by the respective Internet pioneer, including: Vint Cerf, one of 'the fathers of the Internet,' who developed Transmission Control Protocol (TCP) and the Internet Protocol technology and the first commercial email system; Bob Kahn, the other 'father of the Internet,' who along with Cerf invented TCP and IP; Leonard Kleinrock, who played an influential role in the development of the ARPANET, the precursor to the Internet; and Radia Perlman, who is most famous for her invention of the spanning-tree protocol (STP), which is fundamental to the operation of network bridges. In overall very fine condition.