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Female worker holding blueprints while inspecting electrical switchboard at construction site, copy space

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$Male ophthalmologist examining eyes of a young patient using refractometer during a medical examination in the office.$

Close-up of hands of doctor inside helicopter emergency medical service while using digital tablet during a night mission flight.

Computer engineer, working or walking in server room for cyber security or troubleshooting a glitch in network. Person, IT support or ear protection for sound and analytics for coding information

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Police, emergency and officer with gun calling backup for an investigation or law protection in city or urban town. Criminal, radio and legal service team or security on duty for justice enforcement

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Engineer checking Industrial fire control system,Fire Alarm controller, Fire notifier, Anti fire.System ready In the event of a fire.

Redhead man during his annual eye test check-up at the opticians

A team of engineers examined the electrical switchboard while checking the operational voltage range.

Success is a personal standard

Ambulance, patient and paramedic with tablet for healthcare with technology, communication and doctor update. Ems, accident and victim with oxygen mask, digital medical service and transportation

Cropped shot of a handsome young male traffic officer checking a license at a roadblock

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Free Images: "bestof:Joshua Hadler (8577225851).jpg NIST laser safety officer Joshua Hadler and his apparatus for measuring the properties of handheld laser devices See also http //..."

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Frequency Comb (6283421330).jpg

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NIST Physicists Boost Entanglement of Atom Pairs (5940505535).jpg

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New NIST Mini-Sensor May Have Biomedical and Security Applications (5941061812).jpg

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VANTAs (5974655875).jpg

US_Navy_050520-N-7265L-008_Carrier_Air_Wing_Nine_(CVW-9)_Commanding_Officer,_Capt._James_Spence,_inspects_a_Laser_Guided_Bomb_during_pre-flight_checks_of_an_F-A-18C_Hornet.jpg

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Starlight (6815972618).jpg

Quantum Dots and Gold Nanoparticles (8434990793).jpg

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Experimental Atomic Clock; ytterbium atoms (5941021758).jpg

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