The G 50 to 150 Gear-switches are designed for a diverse range of applications from the control and positioning of carriages, portals and bridges, used in studios and at stages, to the monitoring and control of outriggers, trolleys and cranes as well as on door and gate control systems on the industrial style ovens. Some of the less conventional uses include control of weirs and locks in waterways and roof controls in greenhouses and sport arenas. Additionally they are often used in environmental protection applications in sewage plants and flue gas treatment plants.