Volz is located in Offenbach, Germany and produces high end actuators for industrial and aerospace applications. Volz has several consumer off the shelf (COTS) solutions and can also develop custom solutions. Volz servos are flying on several global UAV platforms around the world including the following (in the public domain): Lockheed Martin Fury 1500, Northrop Grumman BAT, AAI Corp Aerosonde Mk4.7, Aeronautics Orbiter, EADS Cassidian DO-DT target drones, and Schiebel Camcopter S-100. Volz have high end optional features such as brushless motors, contactless sensor, position feedback, and clutch mechanisms providing a highly reliable actuator solution. Volz also has submersible solutions that are proven to 100m/300ft or 10bar/145psi. They also have redundant and OP variants of their DA26 and DA30 servos. All hardware has traceability which can be difficult to obtain from high volume hobby RC servos.
Check out www.uavpropulsiontech.com/volz for more info.