From the Bendix Scully-Jones company - Industrial Tools Division, this slide calculator/rule gives dimensions for quickly drawing or machining stub tapers.

Slide is made of heavy card stock, with grommeted corners, with slide out card stock as well  

Measures approx 8 1/4 x 4"

Looks like this was handed out to employees of General Motors Corp, Chevrolet Motor Div, in Moraine Engine plant, as it has a label on the bottom.

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