Synonyme wurden verwendet für:
Coal mines and mining
Suche ohne Synonyme:
keywords:("Coal mines and mining")
Safety of underground transport
Safety of underground transport
Locomotive and mine-car systems
Extraction of stoops by shuttle cars and loaders
Betriebskosten und Selbstkosten der Zechenbahnen
Haulage accidents in coal mines
Aerial ropeway for transporting coal
The Tilmanstone aerial ropeway