I'd much sooner think they are manual reviewers unless you have content Google employees might actually be searching for during their lunch breaks??? If they were all the same IP and the same user-agent it could easily have been just that(one guy on a lunch break or something), but generally if you're doing anything questionable it might be a manual reviewer.
Google have bots to test your site, they have bots that will visit and render your site in full for better indexing.
example, if you have a ton of backlinks on your site google may index them untill they do a rendering crawl. if the elements are hidden from render they wont be indexed.
google will do this for any time of broswers to simulate what a real visitor will see.
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