Machines, namely for transferring solid, liquid, and gaseous materials (media) between parts which are moveable and in particular rotatable to one another; slip ring brushes; dynamo brushes.

Devices, assemblies, and/or components for transmitting electrical and optical signals and/or energy as well as for data transmission between units which are movable in relation to one another comprised of electrical couplings, electric current collectors, rotary couplings, rotary joints, and rotary joint brushes, all sold together as one unit