In 1897.
"So in 1897 he approached the Indiana state legislature with a proposal: if they officially declared the proof correct, he’d let them use it free of charge, thereby saving a lot of money on royalties."
"So in 1897 he approached the Indiana state legislature with a proposal: if they officially declared the proof correct, he’d let them use it free of charge, thereby saving a lot of money on royalties."
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