Please enjoy this very rare piece of history, the CEi SDC-1 single digit Numitron tube clock from the early 1970's! This is the first ever single digit clock design.
-See the CEi DDC-1:
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-See the CEi DWC-1:
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-See the Monodigichron based on the CEi SDC-1:
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- See the 1973 Popular Electronics on how to build the Monodigichron or SDC-1:
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-See an article from 1975 with some of CEi's information on other models.
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