A telephone base with a display unit having a housing which is pivoted to the base. To locate the display unit in any desired angular position in simple manner, the housing has a convex outer surface formed on a constant radius centered on the pivotal axis and a plurality of parallel grooves are provided...http://www.google.fr/patents/US5187743?utm_source=gb-gplus-shareBrevet US5187743 - Telephone base with a display unit
