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What is Patent Number 821,393?

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You will see a patent drawing for an invention with its name and its inventors’ names hidden.

Quickly scan this document. What do you notice first?

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  • Describe the document and the invention it depicts as if you were explaining it to someone who can’t see it.
  • Based on what you can see, what do you think is the purpose of this invention? List evidence from the document to explain your opinion.

After you have made a hypothesis, click “View Primary Source Details” to reveal the invention.

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