Potential answers for "Inventor's milestone"

⭐⭐⭐⭐ PATENT
⭐⭐ EVENT
⭐⭐ IPO
⭐⭐ KEYEVENT
⭐ OTIS
⭐ ALVA
⭐ MOHS
⭐ HOWES
⭐ PULLMAN

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