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An adult education class in electricity with the teacher writing sin wave patterns on the board. Focus on the teacher and what he's writing.

Stock Photo:
Image ID: 3677493
Release Information: Signed model release filed with Shutterstock, Inc
Copyright:
Small
500x337 6.9"x4.7" (72dpi) 191 KB
Med
1000x674 3.3"x2.2" (300dpi) 667 KB
Large
3000x2021 10.0"x6.7" (300dpi) 2.8 MB
Super
6000x4042 20.0"x13.5" (300dpi) approx.8.2 MB
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