File:Experiment Support Scientist Matthew Roper demonstrating Holter Monitor 2 hardware (2).jpg
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![File:Experiment Support Scientist Matthew Roper demonstrating Holter Monitor 2 hardware (2).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/0/07/Experiment_Support_Scientist_Matthew_Roper_demonstrating_Holter_Monitor_2_hardware_%282%29.jpg/800px-Experiment_Support_Scientist_Matthew_Roper_demonstrating_Holter_Monitor_2_hardware_%282%29.jpg?20180921142750)
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Categories:
- Holter monitors
- Men with blue background
- Men with finger rings
- Matthew (given name)
- Men facing left
- Men looking down
- Men wearing blue shirts
- People associated with NASA
- People of the United States in 2011
- Roper (surname)
- Male scientists from the United States
- Scientists in 2011
- 21st-century men of the United States