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Application filed by Kloeckner Humboldt Deutz AgfiledCriticalKloeckner Humboldt Deutz Ag
Publication of DK344676ApublicationCriticalpatent/DK344676A/en
Optical control of closed space, e.g. of furnace contg. material charged atmosphere - using inspection glass closing sight opening in wall enclosing space with inside surface of inspection glass acted on by rinsing gas