KBK update for Monday, 24th August
While searching for any remaining details on Oak Series 400 switches, I found instead the Manual Input Devices section of Computer Design from December 1965, because it mentions Oak rocker digit selector switches, and Digitran’s Series 400 thumbwheels.
The article itself was a fortunate discovery, as it covers a number of very early keyboard types from the 1960s. This included two models (PK-144 and PK-164) from Invac, who claimed to have invented the photoelectric (optical beam) keyboard, for which they filed a patent as early as the end of 1960. From here, I was able to find brochures for both PK-144/PK-164 and the later Series PK-200, now all described on the new Invac page.
Photoelectric encoding is now also mentioned on the encoding and output page.
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