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U.S. changed to first-to-file in 2013.

No country use first-to-invent anymore.

For patents, but not trademarks. Trademarks are still first-to-use.

Trademarks generally, in my admittedly limited experience (UK, USA, EU), are "first to use the mark for trade".

It's a slim but important distinction, but it's not like copyright works. You don't get to register someone else's trademark because you wrote it down somewhere and kept it in the safe for 20y.

Though with unregistered marks you may not be able to stop someone else from using a mark they adopted independently after your first use. Trademarks are territorial, and classification based (registered marks are registered for a particular class of business; not relevant in the OP, but worth mentioning).

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