A Theobald SA

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6533574 System for active regulation of the air/gas ratio of a burner including a differential pressure measuring systemExpiredSep 06, 00Mar 18, 03[F23N]
6418793 Differential pressure sensorExpiredAug 08, 00Jul 16, 02[G01L]
6293514 Flow regulation valveExpiredJul 20, 00Sep 25, 01[F16K]

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