> 2: Since probably the early 1990's, there have been torque converter
> clutches.

Oh, they go back a lot further than that. They were very well
established when my father got the manual for his 1958 Wolseley 6/90,
which described the Borg Warner automatic gearbox and torque converter
that was available for that model. They would have been used since
automatic gearboxes became available on UK manufactured vehicles.
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