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Tek 1m1 front.jpg | '''[[1M1|1M1 – Calibration aid]]''', 1964 | Tek 1m1 front.jpg | '''[[1M1|1M1 – Calibration aid]]''', 1964 | ||
Tek tu2 crop.jpg | '''[[TU-2|TU-2 – Calibration aid]]''' | Tek tu2 crop.jpg | '''[[TU-2|TU-2 – Calibration aid]]''' | ||
Tek 1m1 front. | Tek 1m1 front.jpeg | '''[[TU-7|TU-7 – Same as 1M1]]''' | ||
</gallery> | </gallery> | ||