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Unipolar spiral coil electrode for monitoring the electrical activity of the brain

  • US D317,502 S
  • Filed: 10/15/1987
  • Issued: 06/11/1991
  • Est. Priority Date: 10/15/1987
  • Status: Expired due to Term
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1. The ornamental design for a unipolar spiral coil electrode for monitoring the electrical activity of the brain, as shown and described.

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