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Lincoln Writer, units 65, 71 (input), 66, 72 (output).
A TX-2 unit is always either for input or output, not both (consider for example that the TSD instruction specifies no direction - it is implicit).
The Lincoln Writer (Lincoln Lab Group Report 51-8) states on page 10 that the Lincoln Writer prints about about 10 characters per second (i.e. slightly slower than the IBM Selectric typewriter’s 14.8 characters per scond).