KBK update for Friday, 20th December

The Interdata Master Part Number List from the 26th of January 1979 listed some curious part numbers for what seemed to be 2SD Series keycaps, for Micro Switch SD switches. These are now confirmed to be true, per 2SD Series Chart 30 M supplied by Honeywell. The same part number was used the Interdata listing for three colours and three legends appears, which seemed incorrect, but from the chart, appears to indicate that the part numbers in the Interdata part number list are incomplete. 2SD339 (as listed) does not include the legend text or colours; these are additional characteristics beyond the basic catalogue listing, which only indicates a single-level, single-unit keycap with integrated red LED.

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