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Application filed by Fhv Ingenioerofficer Pieter Au, Otto Van KeulenfiledCriticalFhv Ingenioerofficer Pieter Au
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Publication of DK36797CpublicationCriticalpatent/DK36797C/en
Apparatus for automatic control of closing devices, e.g. Dampers, valves or taps, to achieve a constant difference between the temperatures of two measuring points.