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Google memorizes pages and has a patent for the memorization of pages. What does this mean, is this just Google Cache?
yes it is the cached pages.
Google cached pages
I think that memorized page is the so called cached web pages that when the site is down you get to view the saved pages by Google of that site. However it is clear that Google has a notice that it is a cached page that it may not be the current content since it is the version when the webpage was cached. But at least you get to see a semblance of the webpage that you want to see.