Main prod. Group survey   Industriegruppenübersicht  
  deu 		  Résumé de groupes industriels  
  fra 		  Sumario de grupos industriales  
  esp

23

Construction

Object building

Drillings and foundations

1071.11

Bores

1071.12

Trial borings to prove strata

1071.16

Horizontal boring

1071.17

Combined air drilling

1071.18

Rotary drilling

1071.19

Deep drilling

1071.20

Dry drilling

1071.21

Borehole casings

1071.24

Underground depot construction (rock and salt caverns, root cellars)

1071.32

Well sinkings

1071.51

Foundations

1071.59

Underpin of buildings