Public domain photos

The image shows a small black box with a small piece of paper next to it on a gray surface. On the paper there is a barcode and a scale, and in the box there is an object, which appears to be a slide rule.

The image shows a small black box with a small piece of paper next to it on a gray surface. On the paper there is a barcode and a scale, and in the box there is an object, which appears to be a slide rule.Open in library