Protractors

 If you've ever used one of these, we were soldiers in the same Army.  They were ubiquitous in the combat arms.  Supply rooms had stacks to them.  Cheap, easy to use, absolutely indispensable to maneuver branches, these things were simply everywhere.

This must be a new edition.  I've never seen this printing.  You may have to click the picture to get the full translation.

Heh.  I would have had a lot of fun with this edition.