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by mathiasx 4693 days ago
I received a reply on Twitter from Bill Buxton, who worked at Xerox/PARC and other cool places, pointing me at this chapter out of his book:

http://www.billbuxton.com/input06.ChordKeyboards.pdf

The section "The NLS System: Engelbart and English" contains the most detailed explanation of Engelbart's chording keyboard that I've found, and the rest of the chapter is an interesting read.