Question: In which year did one of the two independent Drexel University alumni inventors of packet switching graduate ?

text: List of Drexel University alumni
Notable alumni -- Science and engineering

Drexel University is a private university located in Philadelphia, Pennsylvania, United States. The 16th largest private university in the nation, Drexel is made up of nine colleges and four schools, most of which serve both undergraduate and graduate students. It offers 96 undergraduate degree programs, 88 master's programs, and 35 doctoral programs. Drexel was founded as a technical school in 1891 for the improvement of industrial education as a means of opening better and wider avenues of employment to young men and women. Drexel began awarding undergraduate degrees in 1914, starting with the Bachelor of Science in engineering; before that, Drexel granted certificates or diplomas in the field of enrollment. In 1931, Drexel began offering graduate degrees through the School of Home Economics. Since its founding the university has graduated over 100,000 alumni. Certificate-earning alumni such as artist Violet Oakley and illustrator Frank Schoonover reflect the early emphasis on art as part of the university's curriculum. With World War II, the university's technical programs swelled, and as a result Drexel graduated alumni such as Paul Baran, one of the founding fathers of the Internet and one of the inventors of the packet switching network, and Norman Joseph Woodland the inventor of barcode technology. In addition to its emphasis on technology Drexel has graduated several notable athletes such as National Basketball Association (NBA) basketball players Michael Anderson and Malik Rose, and several notable business people such as Raj Gupta, former President and Chief executive officer (CEO) of Rohm and Haas, and Kenneth C. Dahlberg, former CEO of Science Applications International Corporation (SAIC).
Name Grad year Degree Notability
Paul Baran 1949 BS One of the inventors of packet switching and a founding father of the Internet
Michael Behe 1974 BS American biochemist and leading advocate of the pseudoscientific principle of intelligent design
Samuel P. De Bow , Jr 1976 BS Former rear admiral in the National Oceanic and Atmospheric Administration Commissioned Corps
Bruce Eisenstein 1965 MS 38th President of the Institute of Electrical and Electronics Engineers
David H. Geiger - BS Architect and engineer who invented the air-supported fabric roof system used in domed stadiums
Walter Golaski 1946 BS Developer of the first practical artificial blood vessel replacement
Harry Gold 1936 Cert Laboratory chemist who was convicted of being the courier for a number of Soviet spy rings during the Manhattan Project
John Gruber 1996 BS Creator of the computer markup language Markdown and the website Daring Fireball
Jon Hall 1973 BS Open source developer and advocate
Vasant Honavar 1984 MS Director Pennsylvania State University Center for Big Data Analytics and Discovery Informatics
Moshe Kam 1985 1987 MS PhD 49th President of the Institute of Electrical and Electronics Engineers
Bruce E. Maryanoff 1969 1972 BS PhD Medicinal and organic chemist responsible for the drug Topiramate
Cynthia A. Maryanoff 1972 BS Organic and biomaterials chemist ; winner of two American Chemical Society National Awards
Arlene Minkiewicz 1988 MS Chief scientist at PRICE Systems
James G. Nell 1961 BS Engineer and systems integrator
Bernard Silver 1947 BS Early developer of barcode technology with Norman Joseph Woodland
Norman Joseph Woodland 1947 BS Inventor of barcode technology