1834 in R. G. Hill (1839) 89 The wristlocks..should be..made so as to be locked by one key throughout, of which a duplicate should be hung up in each restraint room.
1950 5 May 36/3 Numerous violent patients, confined to restraint rooms, become sane in ten minutes.
2005 T. Yarborough viii. 192 The older man was in restraints. Hieu came to the door of the restraint room and tried to talk to him.