I did say that I would post all of my plastic ruler collection and I got close but a few duplicates did not make it in the picture because I ran out of space. This collection covers the late 50s to the 80s with most from Sterling Plastic followed by Pedigree. I believe only one protractor is not made in the US. Protractors and rulers on the left side that are not carded are currently being used and do not forget that they can also be used as bookmarks. These type office and school items are getting harder to find and I encourage you to pick up a few of these before they are all gone. Over the years I have found them on eBay, garage sales and flea markets. Every school or office supply collection should also include a slide rule. These items are made of plastic, they do break so if you see them jump. This post has given me an idea for future posts which would include all my Sterling Plastic items and all my plastic pencil boxes. Add them all to your collection.