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TEST DEVICE FOR DETECTING LOW CONCENTRATIONS OF SUBSTANCES IN FLUIDS

  • US 3,811,840 A
  • Filed: 04/01/1969
  • Issued: 05/21/1974
  • Est. Priority Date: 04/01/1969
  • Status: Expired due to Term
First Claim
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2. A test device as in claim 1 wherein the wick is a bibulous cellulose material.

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