and yes, even if you invent it first, and publish it first, if someone else applies for the patent and convinces the patent examiner that your publication is not "prior art" (say it was published after the patent application was filed for example), they can get a patent and you will have to stop using your invention or pay them for the privilege.
"Fileing" is not publication, "Fileing" is submitting a patent application to the government.
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