Mitchell Pan and Tilting Head for Anti-Aircraft Triangulation Camera

We have been working on finishing the setup of the showroom this week, and pulled this interesting item out of storage. It is labeled as a Pan and Tilting Head for Use with Anti Aircraft Triangulation Camera, Type CMZ-3B and was built by the Mitchell Camera Corporation for the United States Navy. Beyond that, we have not been able to find out any additional information about it. Has anyone seen one of these before? We would love to learn more about it. It is serial #42, so it must be the answer to something, we are just not sure what yet.