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Portable motion detector and alarm system and method

  • US 8,217,790 B2
  • Filed: 05/26/2009
  • Issued: 07/10/2012
  • Est. Priority Date: 05/26/2009
  • Status: Active Grant
First Claim
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1. An inertial sensor comprising a piezoelectric transducer having a piezoelectric element and a mass mounted on said piezoelectric transducer for shock-induced detachment and self-reattachment.

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