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A - Material processing equipment
B - Equipment for the production, transport and distribution of concrete, mortar and rendering mixes
C - Lifting gear
D - Equipment for earthmoving and soil compaction
E - Road construction machinery
F - Railway track construction equipment
G - Floating equipment
H - Tunnel and mining construction equipment
J - Pile drivers and extractors, soil injection equipment
K - Drilling equipment, diaphragm wall equipment
K.0 - Rock drilling equipment and accessories
K.1 - Hydraulic rotary and percussive drilling rigs with accessories
K.2 - Hydraulic drilling machines, add-on units for dry drilling method with accessories
K.3 - Special drilling machines
K.4 - Casing machines and accessories
K.5 - Miscellaneous drilling rigs and drilling winches
K.6 - Casings and drilling tools for rope excavator operation
K.7 - Augers
K.8 - Tools, string drills and accessories for flush-boring system
K.8.0 - Drilling tools
K.8.1 - Flushing heads
K.8.2 - Drill pipes
K.8.20 - Drill pipe with bell-and-spigot joint
K.8.21 - Drill pipe with internal nipple
K.8.22 - Air-lift drill pipe
K.8.23 - Air-lift drill pipe, threaded joint
K.8.24 - Heavy-weight drill rod for suction/air-lift drill pipes
K.8.25 - Kelly bar for K.8.22, K.8.23
K.8.26 - Stabilizer
K.9 - Diaphragm wall equipment and miscellaneous drilling equipment
L - Equipment for pipe jacking and pipeline construction
M - Equipment and plants for decontamination and environment protection
P - Transport vehicles
Q - Air compressors, pneumatic tools
R - Equipment for power generation, transformation and distribution
S - Hydraulic cylinders and hydraulic units
T - Centrifugal and piston pumps, pipelines
U - Formwork and scaffolds
W - Workshop machines and equipment
X - Construction site accomodations, containers
Y - Equipment for surveying, laboratory, office, communication and monitoring
register number K.8.21 Drill pipe with internal nipple
data processing short term GESTAENGEROHR I NIPP
standard
equipment		 Smooth on the outside, for rotary percussion drilling, Effective length 1.00 - 3.00 m.
With internal nipple.
classification classification due to replacement value
register of construction equipment 1991 4332