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summary
Auxiliary ventilation for mining; flexible plastic air ducts for exhaust and forced ventilation; spiral air ducts. (Sonderbewetterung im Berbau; Wetterlutten aus faltbarem Kunststoff für saugende und blasende Bewetterung; Spirallutten.)
Details
Publisher
DIN
File size
394.18 KB
Pages
3
Format
PDF
Publication date
1990-07-01