The development of proximity fuses was amazing. They were so vital the Allies spent a billion 1940s dollars on them (not on development or munitions containing

The development of proximity fuses was amazing. They were so vital the Allies spent a billion 1940s dollars on them (not on development or munitions containing them, just on building the actual fuses). Here are some articles: https://slate.com/technology/2020/08/12-seconds-silence-merle-tuve-vannevar-bush-fuse.html https://slate.com/technology/2020/08/12-seconds-silence-merl..., https://www.historynet.com/proximity-fuze/ https://www.historynet.com/proximity-fuze/