Editing Intel 4004 (section)

===Earliest documents on the Intel 4004===
*[http://www.intel4004.com/sign.htm Initials F.F. (Federico Faggin) on the 4004 design (1971)]. The 4004 bears the initials F.F. of its designer, Federico Faggin, etched on one corner of the chip. Signing the chip was a spontaneous gesture of proud authorship and was also an original idea imitated after him by many Intel designers.
*F. Faggin and M. E. Hoff: "Standard parts and custom design merge in four-chip processor kit". Electronics/April 24, 1972, pp.&nbsp;112–116. Reprinted on pp.&nbsp;6–27 to 6–31 of [https://web.archive.org/web/20110323004736/http://www.bitsavers.org/pdf/intel/_dataBooks/MemoryDesignHandbook_Aug73.pdf ''The Intel Memory Design Handbook: August 1973''].
*F. Faggin, M. Shima, M. E. Hoff Jr., H. Feeney, S. Mazor: "The MCS-4—An LSI micro computer system". IEEE '72 Region Six Conference. Reprinted on pp.&nbsp;6–32 to 6–37 of [https://web.archive.org/web/20110323004736/http://www.bitsavers.org/pdf/intel/_dataBooks/MemoryDesignHandbook_Aug73.pdf ''The Intel Memory Design Handbook: August 1973''].
*[http://www.computerhistory.org/revolution/digital-logic/12/285/1534 Busicom 141-PF Printing Calculator Engineering Prototype (1971)]. (Gift of Federico Faggin to the Computer History Museum, Mountain View, CA). The CHM collection catalog shows pictures of the engineering prototype of the Busicom 141-PF desktop calculator. The engineering prototype used the world's first microprocessor to have ever been produced. This one-of-a-kind prototype was a personal present by Busicom's president Mr. Yoshio Kojima to Federico Faggin for his successful leadership of the design and development of the 4004 and three other memory and I/O chips (the MCS-4 chipset). After keeping it in his home for 25 years, Faggin donated it to the CHM in 1996.
*Faggin, F.; Capocaccia, F. "A New Integrated MOS Shift Register", Proceedings XV International Electronics Scientific Congress, Rome, April 1968, pp.&nbsp;143–152. This paper describes a novel static MOS shift register, developed at SGS-Fairchild (now ST Micro) at the end of 1967, before Federico Faggin joined Fairchild's R&D in Palo Alto (Ca) in February 1968. Faggin later used this new shift register in the MCS-4 chips, including the 4004(1970).