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4 devices are known to have existed in 1945, 3 were detonated. A few more may have been prepared as the US had 20 more devices in various stages of production scheduled that year.
By the end of operation Crossroads in the summer of 1946, a total of 9 devices had been built, 5 were detonated, leaving a stockpile of 4 devices.
I use the term devices above because not all were built into gravity bomb cases for delivery by bomber. Also the devices were not preassembled, but came as a kit in 2 crates that had to be assembled in the field by a trained expert team. It took a team about 3 days to assemble a device. By early 1946 as planning for Crossroads was begun it was discovered they no longer had any assembly teams and had to start a new training program.
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When was the first Nuclear Weapons made?
1945
What year was the last attack with nuclear weapons?
1945
How long has nuclear weapons been around?
Since 1945.
Where did nuclear weapons first start in the world?
The first ever nuclear explosion was a test in New Mexico in 1945
In regard to nuclear weapons explain the importance what dates 1945 1949 1957?
1945 bombs droped on japan 1949 Russia created a nuclear bomb 1957brittan got a nuke
