Posted By: NH daughter
Folding ruler Klein and sons incorporated Chicago - 09/02/14 12:22 AM
Do you have any information on this ruler ?
#905-6. (Model number)
Brass bound folding ruler.
Posted By: Roger Nair
Re: Folding ruler Klein and sons incorporated Chicago - 09/02/14 02:05 AM
Like this?
http://www.kleintools.com/catalog/folding-rules/wood-folding-rules-extensionZig-zag rules are very common and as you can see in the current catalog. Such rulers were I believe a German invention by the founder of the Stabila level company in the nineteenth century.