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  • US 6,267,000 B1
  • Filed: 10/21/1999
  • Issued: 07/31/2001
  • Est. Priority Date: 10/25/1996
  • Status: Expired due to Fees
First Claim
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1. Ground-motion detection apparatus comprising a multiplicity of discrete ground-motion sensors each in use contactable with the ground, together with a body of a damping material to hold each sensor in ground contact and thereby avoid significant mounting resonance effects between the sensor and the ground.

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