I'm trying to determine the first product that could automatically decode and 
display a digital time code.  Digital time codes were added to WWV in 1960 and 
WWVB in  1965.  This was before they were added to any satellite  signals, or 
before they were added to LF stations in Europe, such as DCF77.  Telegraphic 
time codes, of course, were around much earlier.

I currently think the first true radio controlled clock that decoded a digital 
time code was the Develco 3391, introduced around 1969.  It received WWVB 
signals and was used by the electric power industry.

Does anyone know of anything earlier?  Also, has anyone seen a Develco 3391 or 
have a good picture of one?

Any help would be appreciated.

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