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summary
Auxiliary ventilation in mining; flexible plastic air ducts for forced ventilation; flat air ducts. (Sonderbewetterung im Bergbau; Wetterlutten aus faltbarem Kunststoff für blasende Bewetterung; Flachlutten.)
Details
Publisher
DIN
File size
364.96 KB
Pages
3
Format
PDF
Publication date
1988-12-01