26 Devices for Signaling the Position of Moving Elements Such as the Surface of a Stream, or the Water Level in a Tank or Reservoir, the Extent of Opening of a Gate or a Valve, the Indicator of a Gasometer, and Other Such Devices, Including Equipment for Transmitting the Signals Audibly, Visually, Telephonically, Telegraphically, by Radio Telephone or Other Such Devices to Positions Remote from the Moving Elements, With or Without Means for Recording the Movements of Such Moving Elements
Trademark: 72104617
