rest - roll
- rest pause
- rest period
- rest room
- restraining line
- restricted space
- resuscitate
- resuscitation
- reticular fibrosis
- reticular lung marking
- retrospective study
- return spring
- reverberant noise
- reverberation
- reverberation room
- reverberation time
- reverse-jet bag filter
- reverse-jet filter
- rheumatoid factor
- rheumatoid pneumoconiosis
- rickettsial disease
- rickettsiosis
- ricochet
- right to compensation
- right to information
- right to know
- rim exhaust
- ring dosimeter
- ring test
- ringing in the ears
- rising-screen guard
- risk
- risk awareness
- risk management
- risk prevention
- riving knife
- rock burst
- rock-dust barrier
- rocking-key clutch
- Rocky Mountain spotted fever
- Roentgen-ray cataract
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