One interesting supply chain is the EF50 vacuum tube, which was manufactured in Holland and was vital for radar in World War II. Hours before the Germans took o

One interesting supply chain is the EF50 vacuum tube, which was manufactured in Holland and was vital for radar in World War II. Hours before the Germans took over Holland, the British trucked out 25,000 tubes and key manufacturing equipment so they could start manufacturing the tubes in England. https://en.wikipedia.org/wiki/EF50#Flight_from_Holland https://en.wikipedia.org/wiki/EF50#Flight_from_Holland