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    Construction workers using torque wrench to secure water main section with bolts — Stock Photo
    Construction workers using torque wrench to secure water main section with bolts
    Male student practicing experiment in lab — Stock Photo
    Male student practicing experiment in lab
    Teenage girl performing experiment in chemistry lab — Stock Photo
    Teenage girl performing experiment in chemistry lab
    Construction workers attaching sections of water main together in front of excavator — Stock Photo
    Construction workers attaching sections of water main together in front of excavator
    Engineer in electric power plant adjusting manual valve in condenser room piping — Stock Photo
    Engineer in electric power plant adjusting manual valve in condenser room piping
    Digital forensic expert examining computer hard drive in police science laboratory. — Stock Photo
    Digital forensic expert examining computer hard drive in police science laboratory.
    Lineman climbing a pole for installation — Stock Photo
    Lineman climbing a pole for installation
    University student doing experiment on microscope in laboratory at college — Stock Photo
    University student doing experiment on microscope in laboratory at college
    Female digital forensic expert examining computer hard drive with electronic equipment in police science laboratory. — Stock Photo
    Female digital forensic expert examining computer hard drive with electronic equipment in police science laboratory.
    Construction worker using strap on excavator to guide water main section — Stock Photo
    Construction worker using strap on excavator to guide water main section
    Construction supervisor using surveying rod — Stock Photo
    Construction supervisor using surveying rod
    Construction workers cutting water main to length with gas powered saw — Stock Photo
    Construction workers cutting water main to length with gas powered saw
    Engineer in electric power plant inspecting a electrically controlled valve — Stock Photo
    Engineer in electric power plant inspecting a electrically controlled valve
    Side view of male college student practicing chemistry experiment in lab — Stock Photo
    Side view of male college student practicing chemistry experiment in lab
    Female students performing chemistry experiment in lab — Stock Photo
    Female students performing chemistry experiment in lab
    Attentive university students doing a experiment in laboratory — Stock Photo
    Attentive university students doing a experiment in laboratory
    Construction supervisor using electronic surveying rod — Stock Photo
    Construction supervisor using electronic surveying rod
    Construction workers climbing down ladder into shoring — Stock Photo
    Construction workers climbing down ladder into shoring
    Cable installer preparing to climb the line with ladder — Stock Photo
    Cable installer preparing to climb the line with ladder
    Cropped image of Water department technician shutting fire hydrant to flush water pipes — Stock Photo
    Cropped image of Water department technician shutting fire hydrant to flush water pipes
    Portrait of university student in protective eyewear at laboratory — Stock Photo
    Portrait of university student in protective eyewear at laboratory
    Construction workers taking a break — Stock Photo
    Construction workers taking a break
    Police forensic analyst taking notes while examining confiscated mobile phone. — Stock Photo
    Police forensic analyst taking notes while examining confiscated mobile phone.
    Female digital forensic expert examining computer hard drive and taking notes in police science laboratory. — Stock Photo
    Female digital forensic expert examining computer hard drive and taking notes in police science laboratory.
    Young male student using vise grip in shop class workshop — Stock Photo
    Young male student using vise grip in shop class workshop
    Construction workers preparing to climb down hole with ladder — Stock Photo
    Construction workers preparing to climb down hole with ladder
    Portrait of teenage girl holding clipboard while standing in lab — Stock Photo
    Portrait of teenage girl holding clipboard while standing in lab
    Construction workers attaching sections of water main together in front of excavator — Stock Photo
    Construction workers attaching sections of water main together in front of excavator
    Digital forensic science technician examining computer hard drive with magnifying glass and taking notes in laboratory. — Stock Photo
    Digital forensic science technician examining computer hard drive with magnifying glass and taking notes in laboratory.
    Factory interior of Chongqing City, China — Stock Photo
    Factory interior of Chongqing City, China
    Cable installer applying weather proof sealant to the cable installation — Stock Photo
    Cable installer applying weather proof sealant to the cable installation
    Teenage female student using machinery in laboratory at college — Stock Photo
    Teenage female student using machinery in laboratory at college
    Close-up of digital forensic expert examining computer hard drive in police science laboratory. — Stock Photo
    Close-up of digital forensic expert examining computer hard drive in police science laboratory.
    Factory interior of Chongqing City, China — Stock Photo
    Factory interior of Chongqing City, China
    Hispanic carpenter using finish trowel to roughen stairway footing concrete — Stock Photo
    Hispanic carpenter using finish trowel to roughen stairway footing concrete
    Female digital forensic expert examining computer hard drive with electronic equipment in police science laboratory. — Stock Photo
    Female digital forensic expert examining computer hard drive with electronic equipment in police science laboratory.
    University students doing experiments together in laboratory — Stock Photo
    University students doing experiments together in laboratory
    Carpenter using a circular saw for cutting rafter — Stock Photo
    Carpenter using a circular saw for cutting rafter
    Female power engineer adjusting water valves at power plant — Stock Photo
    Female power engineer adjusting water valves at power plant
    Power Plant engineers one with spinal cord injury discussing demineralization process equipment — Stock Photo
    Power Plant engineers one with spinal cord injury discussing demineralization process equipment
    Communications worker carrying a ladder from truck to make installation — Stock Photo
    Communications worker carrying a ladder from truck to make installation
    Female power engineer putting equipment into bucket truck — Stock Photo
    Female power engineer putting equipment into bucket truck
    Construction worker climbing down ladder into shoring — Stock Photo
    Construction worker climbing down ladder into shoring
    Hispanic carpenters using trowel to smooth concrete for staircase footing — Stock Photo
    Hispanic carpenters using trowel to smooth concrete for staircase footing
    Police forensic expert examining confiscated mobile phone and taking notes in science laboratory. — Stock Photo
    Police forensic expert examining confiscated mobile phone and taking notes in science laboratory.
    Digital forensic science technician taking notes while examining computer hard drive. — Stock Photo
    Digital forensic science technician taking notes while examining computer hard drive.
    Water department technician reinstalling caps on fire hydrant — Stock Photo
    Water department technician reinstalling caps on fire hydrant
    Male electrician students practicing in workshop — Stock Photo
    Male electrician students practicing in workshop
    Teenage girl holding clipboard while practicing experiment in lab — Stock Photo
    Teenage girl holding clipboard while practicing experiment in lab
    Carpenter preparing to use level on house framing — Stock Photo
    Carpenter preparing to use level on house framing
    Cable lineman removing ladder from his truck — Stock Photo
    Cable lineman removing ladder from his truck
    Female power engineer climbing inside safety cage ladder at power station — Stock Photo
    Female power engineer climbing inside safety cage ladder at power station
    Carpenter moving roof rafter into place — Stock Photo
    Carpenter moving roof rafter into place
    Hispanic carpenter nailing pressure treated deck joist with hammer — Stock Photo
    Hispanic carpenter nailing pressure treated deck joist with hammer
    Hispanic carpenter putting smooth edge on stairway footing concrete — Stock Photo
    Hispanic carpenter putting smooth edge on stairway footing concrete
    Lab technician adding liquid from graduated cylinder to beaker — Stock Photo
    Lab technician adding liquid from graduated cylinder to beaker
    Police digital forensic science expert taking notes while investigation. — Stock Photo
    Police digital forensic science expert taking notes while investigation.
    Water department technician using flow rate sensor — Stock Photo
    Water department technician using flow rate sensor
    Police digital forensic science expert taking notes while investigation. — Stock Photo
    Police digital forensic science expert taking notes while investigation.
    Female power engineer checking condensation at power station — Stock Photo
    Female power engineer checking condensation at power station