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brown and white measuring ruler
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brown and white measuring ruler

In the seventies of the previous century I learned to use the sliding rule to make my calculations. I kept the rule and now and then I show it to people. You then can expect two kinds of reactions: 1. What’s that (people who never used it before) 2. Oh, how nice a sliding rule (people who used it)

Calendar outlinedPublished on CameraOLYMPUS IMAGING CORP., E-M10SafetyFree to use under the Unsplash License

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