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Pipe fitting
Plumbing
12
Mathematics
8
Maintenance and repair
7
Piping
6
Pipe
5
Equipment and supplies
4
Design and construction
3
Standards
3
Building
2
Computer programs
2
Drawings
2
Engineering mathematics
2
Formulae
2
IBM Personal Computer
2
Natural gas pipelines
2
Pipefitting
2
Plumbing work
2
Programmed instruction
2
Safety regulations
2
Software
2
Distribution
1
Fire sprinklers
1
Hanbooks, manual, etc
1
Handbooks, manuals, etc
1
Pipelines
1
Water
1
Water-supply engineering
1
Welding
1
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