Semi-rigid heads
Further to my last........................
Agusta Westland Lynx manual states it has a semi-rigid main rotor system.
Eurocopter Bo105 and Bk117 training manuals both state semi-rigid rotor system with rigid hub.
The EC135 doesn't have a rotor head as such, it has a rotor hub shaft, to which the blades are attached. All flapping, dragging and pitch change movement is done in the blade spar. It is described as hingeless and bearingless. The only bearings on the mast assembly are on the rotating pitch control rods to the blade cuffs and in the swashplate.
NB. The EC135 was a Bo108 until the French got involved and replaced the conventional 2 blade tail rotor with their 'Fenestron'.