Which company's logo has remained most visually consistent since introducing its breakthrough invention?

Many inventions we use daily have fascinating origin stories that often go unrecognized. Some were accidental discoveries, while others were the result of determined problem-solving. This poll tests your knowledge about the corporate logos behind groundbreaking inventions and how they've evolved to represent innovation throughout history. Can you identify which company's logo has remained most consistent since its invention breakthrough?

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Xerox (since introducing the first plain paper photocopier in 1959)
Sony (since introducing the Walkman portable cassette player in 1979)
Post-it Notes by 3M (since their accidental discovery in 1968)
IBM (since introducing the first personal computer in 1981)