rating - resistance wire
- rectangle-plain barrel
- rectangle-square
- rectification
- rectification column
- recuperation
- recuperation coefficient
- recuperative furnace
- recuperator
- recycling
- red fume
- red hardness
- red oxide of iron
- red shortness
- red-hot temperature
- redistillation
- redox
- redox potential
- reduced (resolved) stress
- reduced normal stress
- reduced powders
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