Add new comment

"Thank you so much for this information! I found a ruler like the image shown above in my mothers's belongings after her passing. This item and info is very dear to me. On the side of knowledge, I find it interesting how precise the process with the ruler must have been in the "old days", based on the info above and the very small numbers and lines on the ruler. And most workers who used them (in the old days) on a daily basis were not engineers, or other precision types. My mother was a perfectionist in her expectations of herself, so I imagine she was very good at using the ruler. Thank you again!"