Editing Key rollover keyboard (patent 3918051) (section)

==Referenced by==

* {{ cite patent | country = US | number = 3978474 | status = patent | title = Keyboard with ''n''-key lockout and two key rollover protection | pubdate =  | gdate = 31 August 1976 | fdate = 15 July 1975 | pridate =  | inventor = Keith Allen Engstrom | invent1 =  | invent2 =  | assign1 = Illinois Tool Works Inc. | assign2 =  | class = }}
* {{ cite patent | country = US | number = 4024534 | status = patent | title = Keyboard encoding with repeat key pause | pubdate =  | gdate = 17 May 1977 | fdate = 24 November 1975 | pridate =  | inventor = Wilbur E. DuVall | invent1 =  | invent2 =  | assign1 = Xerox Corporation | assign2 =  | class = }}
* {{ cite patent | country = US | number = 4037225 | status = patent | title = Keyboard encoding system with electronic hysteresis | pubdate =  | gdate = 19 July 1977 | fdate = 25 November 1975 | pridate =  | inventor = Wilbur E. DuVall | invent1 =  | invent2 =  | assign1 = Xerox Corporation | assign2 =  | class = }}
* {{ cite patent | country = US | number = 4110748 | status = patent | title = Keyswitch with hysteresis | pubdate =  | gdate = 29 August 1978 | fdate = 6 April 1976 | pridate =  | inventor = Francis C. Marino | invent1 =  | invent2 =  | assign1 = Burroughs Corporation | assign2 =  | class = }}
* {{ cite patent | country = US | number = 4300127 | status = patent | title = Solid state noncontacting keyboard employing a differential transformer element | pubdate =  | gdate = 10 November 1981 | fdate = 27 September 1978 | pridate =  | inventor = Victor M. Bernin | invent1 =  | invent2 =  | assign1 =  | assign2 =  | class = }}
* {{ cite patent | country = US | number = 4390866 | status = patent | title = Keyboard with electronic hysteresis | pubdate =  | gdate = 28 June 1983 | fdate = 19 February 1981 | pridate =  | inventor = Keith A. Engstrom | invent1 =  | invent2 =  | assign1 = Illinois Tool Works Inc. | assign2 =  | class = }}
* {{ cite patent | country = US | number = 4494109 | status = patent | title = Noncontacting keyboard employing a transformer element | pubdate =  | gdate = 15 January 1985 | fdate = 28 January 1981 | pridate =  | inventor = Victor M. Bernin | invent1 =  | invent2 =  | assign1 =  | assign2 =  | class = }}
* {{ cite patent | country = US | number = 4538146 | status = patent | title = Integrated circuit output pins used for input signals | pubdate =  | gdate = 27 August 1985 | fdate = 17 September 1982 | pridate =  | inventor = Dennis E. Morris | invent1 =  | invent2 =  | assign1 = National Semiconductor Corporation | assign2 =  | class = }}
* {{ cite patent | country = US | number = 4581603 | status = patent | title = Switch matrix key closure validation device and method | pubdate =  | gdate = 8 April 1986 | fdate = 11 March 1983 | pridate =  | inventor = William E. Ingold | invent1 = Dominic J. Daninger | invent2 =  | assign1 = The Maxi-Switch Company | assign2 =  | class = }}
* {{ cite patent | country = US | number = 4794601 | status = patent | title = Keyboard data entry system with hysteresis | pubdate =  | gdate = 3 November 1987 | fdate = 27 June 1985 | pridate =  | inventor = Keith A. Engstrom | invent1 =  | invent2 =  | assign1 = Illinois Tool Works, Inc. | assign2 =  | class = }}
* {{ cite patent | country = US | number = 4706068 | status = patent | title = Four wire keyboard interface | pubdate =  | gdate = 20 September 1988 | fdate = 30 January 1985 | pridate =  | inventor = Martin F. Eberhard | invent1 =  | invent2 =  | assign1 =  [[Wyse|Wyse Technology, Inc]] | assign2 =  | class = }}
* {{ cite patent | country = US | number = 4772874 | status = patent | title = Keyboard apparatus | pubdate =  | gdate = 20 September 1988 | fdate = 7 December 1987 | pridate =  | inventor = Hiroshi Hasegawa | invent1 =  | invent2 =  | assign1 = [[Topre Corporation]] | assign2 =  | class = }}