programmed / preselected dental unit working positions

"Early in their development, such chairs were customarily preprogrammed at the factory to assume particular positions, but now some have the capability of being adjusted by the health professional to suit his/her particular preferences. (...) The chair is preprogrammed at the factory to assume automatically a selected one of several standard gynecological examination positions. (...)
Early attempts to enable chairs to be adjusted in situ included control systems which operated by timing the operation of motors to bring the various chair components into preselected positions. (...) position No. 1 is shown as a first typical working position, position No. 2 is shown as a second typical working position..."
http://www.wipo.int/pctdb/en/wo.jsp?IA=WO1993018575&wo=19930...

Preset:
"2 x preset positions, last position memory (LP) and auto-return"
http://www.dbdental.co.uk/spcleo.htm

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