An anonymous reader writes: Few devices have been around this long, have had cameo appearances in Star Trek, and remain in use today. The current E6-B looks almost exactly the same as the first one manufactured 75 years ago. It was designed by U.S. Naval Lt. Philip Dalton in the late 1930s. When he completed the final version, it was introduced to the Army in 1940, and later used widely during WWII. Today is a required instrument for flight training, and has appeared on Star Trek original series several times, as Mr. Spock used a E6-B for critical calculations.
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