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Line 9: PCM His work on electrical pulse-code modulation systems<ref>{{cite patent \| country=US\| ~~patent~~ number=US2730676A\| ~~inventor=Barker RH\|~~ title= Electrical Pulse Code Modulation\| url=<https://worldwide.espacenet.com/publicationDetails/originalDocument?FT=D&date=19530520&DB=&locale=en_EP&CC=GB&NR=691810A&KC=A&ND=4#\|application-date=1951/ref> and digital transmission methods also contributed to early experiments in encrypted radar signals and the foundations of modern air traffic control systems.

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