Geek Trivia: Which Of These Office Supplies Was Invented Decades Before It Saw Practical Use?

Which Of These Office Supplies Was Invented Decades Before It Saw Practical Use? |
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Think you know the answer? |
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via: howtogeek.com

Which Of These Office Supplies Was Invented Decades Before It Saw Practical Use? |
|
Think you know the answer? |
|
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