Radio navigation aid
Railroad maintenance vehicle reference system transducer
Real estate electro tape
Reference system for a track working machine
Registry device and method for using same
Relative motion pinwheel
Relative position indicator
Right-angle index device
Robotic system with traction drive
Robotic system with traction drive
Rotary disc for encoder
Rotary displacement measuring apparatus
Rotary displacement system using differential measuring
Rotary displacement transducers
Rotary encoder
Rotary encoder
Rotary encoder
Rotary encoder
Rotary encoder
Rotary encoder and rotor machine