KBK update for Monday, 27th May

I thought I read somewhere that Micro Switch SD Series was DIN-compliant, as highly unlikely as that seems. That would point to an introduction date of around 1982. Very little practical data gathering has taken place with SD Series, so off-hand it was hard to be sure. However, it is now clear that SD Series was in production as far back as 1976, as demonstrated by model 125SD12-1.

This keyboard uses an older part number schema, with one fewer position in the identification number, and seemingly at least one position with a different interpretation to the 1001SD Series schema found from 1998. One possibility is that the old switches were 1SD Series, and that 1001SD was chosen when revising the schema. This remains pure speculation.

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