 |
| |||
| flat-back stoping; horizontal slicing; overhand flat-back stoping | |||
| Firstenstoßbau in söhligen Streifen: 5 phrases in 1 subject |
| Mining | 5 |
|
| |||
| flat-back stoping; horizontal slicing; overhand flat-back stoping | |||
| Firstenstoßbau in söhligen Streifen: 5 phrases in 1 subject |
| Mining | 5 |