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by jacquesm 2122 days ago
You can get back to 1980's tech easily enough if you have 1970's tech. And so on all the way back to about 1920. Whatever you have + the knowledge remaining will allow you to rise up the ladder a little quicker but not that much quicker because you still need to go through all the motions in between. Skipping steps is really hard, most progress is incremental.