 |
| |||
| pier construction | |||
| panel system; panel work; pillaring; post-and-stall; square work; stoop system; chute and pillar; system | |||
| barrier system; board-and-pillar; bord-and-pillar (method); chamber working; panel working; panelling (method); pillar-and-breast (method, s.a. bordand-pillar); pillar-and-panel work; pillar and stall (method); pillar method of working; pillar mining system; post-and-stall (method); punch-and-thirl; rib-and-pillar; rib and stall working; stall-and-room working; stoop-and-room (method); stoop-and-thirl; tunnel-and-pillar mining; wicket (North Wales); wicket work (North Wales) | |||
| Pfeilerbau: 6 phrases in 2 subjects |
| Metallurgy | 1 |
| Mining | 5 |