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Elias decided to sell. He entered a complex ecosystem where patents are traded like stocks. His primary suitors weren't just construction firms, but —sometimes controversially called "patent trolls". These companies don't manufacture products; they buy patents to generate revenue through licensing and litigation.
: Many inventors, like the legendary Alexander Graham Bell with the telephone, hold onto their patents to build empires.
: Others, like Walter Hunt —the mechanic who invented the safety pin in 1849—sell their rights quickly to settle debts or fund the next idea. The Marketplace of Ideas