perm - plai
- permafrost table
- permanent chock
- permanent connection
- permanent joint
- permanent lining
- permanent magnet
- permanent mine opening
- permanent repair
- permanent roadway
- permanent support
- permanent working
- permeability
- permeability of strata
- permeability to heat
- permeable
- permeate
- permeation
- Permian system
- permissibility
- permissible
- permissible concentration
- permissible deviation
- permissible dynamite
- permissible explosive
- permissible stress
- permit
- perpendicular offset
- persistence
- persistence of froth
- persistent
- personal dust exposure monitor
- personal estate
- personal protective equipment
- personnel
- perspective
- perspex
- persrective material
- pertinent date
- pervious
- perviousness
