rota - satu
- roughness factor
- roughness value
- round
- round insert
- round pass
- round set hammer
- round steel bar
- round stock
- round straightener
- round tongs
- round-chart recording
- round-edged flats
- round-hole mesh
- round-point shovel
- round-to-round extrusion
- round-to-section extrusion
- rounded flatter
- rounding tool
- rounding up
- roundness
- rounds
- routine
- routine analysis
- routine examination
- routine inspection
- routine method of determination
- routine observations
- row alloys
- row lines
- row of dislocation
- row of etch pits
- Rowland concave grating
- rowlock bottom
- royer
- royer sand mixer
- RP
- RP-DC
- rubber blanket
- rubber compression
- rubber forming