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Tektronix 911 Statistician Desktop Calculator

10 digit (plus 2 digit exponent) Nixie display, statistical function calculator. Introduced in early '70. Originally made by Cintra, but later rebadged by Tektronix, when Tek purchased Cintra in May of 1971. Physical appearance virtually identical to the Cintra/Tektronix 909 with only difference being function of four keyboard keys.