OB SYSTEMS & MINING, INC.

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
4810950 Load resistance measuring techniqueExpiredJul 17, 86Mar 07, 89[G01R]
4675785 Heat distributing diode mounting assemblyExpiredJul 31, 86Jun 23, 87[H05K]
4368498 Ground conductor monitoring systemExpiredJul 09, 80Jan 11, 83[H02H]

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