Amazing!
Especially when you think that nowadays, the control system tasks could be performed by a single Arduino Uno and a bank of relays. May 1971 was 6 months before the first microprocessor (the Intel 4004 of November 1971) was released*.
Speaking of electromechanical control systems, does anyone remember the "Automatic Crispin" system used by Peter Denny around the same time?
* And it would have been too expensive and difficult for the "average enthusiast" to use... The Uno itself was the first cheap and easy to program microcontroller system, introduced in 2010, so only 14 years ago. It and the even more flexible 2012 Raspberry Pi SBC have been key players in the democritisation of computer controlled applications in the hobbyist environment.