IDM (Instant Dimmer Memory) - 1967
The world's first memory lighting control, the IDM/DL arose out of the need to advance from a three preset manual fader desk to a means of recording the fader levels and instantly reproducing them in performance. The first installation in June 1968 in Schweinfurt, was followed by Budapest Opera and the Coliseum, London. With it's push-button IDM/R variant (the prototype of the DDM) and the later redesigned MSR system, 20 systems were installed around the world.

System IDM. Model illustrated is for 150 channels. From TABS, September 1966.