Successful System for Signaling from Mine Cages at Rest Or in Motion Carl Belser Published: 1944 Total Pages: 40 Get eBook
Technical Paper - Bureau of Mines United States. Bureau of Mines Published: 1946 Total Pages: 964 Get eBook
Suggested Hoisting-signal Code for Slope Coal Mines and for Shaft Mines Having Only One Level Daniel Harrington Published: 1944 Total Pages: 14 Get eBook
Suggested Hoisting-signal Code for Metal-mine Shafts Daniel Harrington Published: 1944 Total Pages: 18 Get eBook
