File:Experiment Support Scientist Matthew Roper demonstrating Holter Monitor 2 hardware.jpg
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Categories:
- Front views of topless men
- Holter monitors
- Men with blue background
- Men with finger rings
- Matthew (given name)
- Men facing left
- Men looking down
- Partially nude people with blue background
- People associated with NASA
- People of the United States in 2011
- Roper (surname)
- Male scientists from the United States
- Scientists in 2011
- Topless men in the United States
- Topless standing men
- 21st-century men of the United States