File in the state where the debtor is organized if a corporation, or where he lives if an individual.
The fact that you're asking about a PMSI makes me wonder if there are other creditors out there with prior security interests in this farmers livestock. If so, that always raises the question about repossession. How will you recognize your cows from all the others? They are not very good about responding to their names when called.
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I thought getting old would take longer.