Manual of Gear Design Section 1-3 Am Gear Man Assn Good Condition Lot Of 3.

As you can tell there are 3 books or sections. Section 1 shows printing date of 1944 as you can see in the pictures. These are all in really good condition, I tried to take pics to show how nice they are. They are blue in color and these are some of the oldest you will find. Nice rare collection