URL：https://www.thoughtco.com/thmb/1_yp4DHBlcpf7k29J-hnQDSu6Wg=/2121x1414/filters:fill(auto,1)/microsoft-sign-at-the-entrance-of-their-silicon-valley-campus-471179856-5c3d5d9a46e0fb00016dd455.jpg
掲載元：https://www.greelane.com/nl/geesteswetenschappen/geschiedenis--cultuur/microsoft-history-of-a-computing-giant-1991140/
