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pencil and a slide rule on the old page with the calculations in mechanics

Stock Photo:
Image ID: 132545192
Copyright:
Small
500x355 6.9"x4.9" (72dpi) 297 KB
Med
1000x709 3.3"x2.4" (300dpi) 1.0 MB
Large
3633x2577 12.1"x8.6" (300dpi) 10.1 MB
Super
7266x5154 24.2"x17.2" (300dpi) approx.33.4 MB
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