The Pamphlet Collection of Sir Robert Stout: Volume 40
Class 63.—Telegraphic Apparatus and Processes
Class 63.—Telegraphic Apparatus and Processes.
370—Hayes, J. E., Lambton Quay, Wellington.
- Electric Office Indicator, designed for mercantile and other purposes
- It enables the occupier, without rising from his chair, to indicate on the outside of his room or office door, whether he is engaged or otherwise. New invention (patented).