quen - reco
- random noise
- random sequence
- random test
- random weighing
- randomly packed bed
- range
- range into line
- range of linearity
- range of measurement
- range of stress
- Ransley apparatus
- rap
- rapid analysis
- rapid analysis method
- rapid ash determination
- rapid corrosion
- rapid determination
- rapid etching constituent
- rapid machining steel
- rapid solidificadon
- rapid steel
- rapid-action hammer
- rapid-record oscillograph
- rapid-response thermocouple
- rapid-setting cement
- rappage
- rapper
- rapping
- rapping bar
- rapping device
- rapping hammer
- rare earth metal.
- rare metal
- rare-earth element
- rare-earth metal master alloy
- rat
- ratchet gear
- ratchet marks
- ratchet stop
- ratchet-wheel gear