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View of the von Braun engineering tools display.

Picture 5 of 5.

View of the engineering tools themselves: A Dietzgen drafting tool set ("Made in U.S.A."), a drawing triangle, and a slide rule.

The "drafting tool set" is a "Dietzgen Commander Drawing Instruments" set. While looking for additional information on this particular set, I found that Dietzgen is still in business today, although no longer seems to sell this particular product line. I was surprised to find that like-new versions of this set can be had on eBay for less than $20, or for as low as $5 if you don't mind if it's "missing 3 pieces."

The sign in the desk drawer reads

Dietzgen Drafting Tool Set
On loan from Dr. Margit von Braun