This timer IC was designed in 1971 by Hans R. Camenzind under contract to Signetics, which was later acquired by Philips. Can be used as a timer, flip-flop or oscillator. Guestimated 10^9 units are made annually making this perhaps most popular IC of all time. Read more via web link to Wiki or interview with Mr. Camenzind http://semiconductormuseum.com/Transistors/LectureHall/Camenzind/Camenzind_Index.htm