Vintage Lockheed Rigid Rotor Circular Slide Rule

Specifications

We are offering for your consideration a Vintage Lockheed Rigid Rotor Circular Slide Rule Key Ring. These are from the late 1960s. I believe these had to do with helicopters, probably built for the Vietnam war. They Measure 1 5/8 inches in diameter and will come to you in the original plastic case with instructions packaged below the foam padding. These came from an estate of a man that worked for Lockheed in the 60s. We are also putting on some small measuring tapes also Lockheed Martin ( please see other auction).

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