The director system of automatic telephony
Subtitle: a book for linesmen, traffic officers, and telephone engineers, who wish to make themselves familiar with the theory of the director system
By: by W. E. Hudson.
Publisher: Sir I. Pitman & sons, ltd.
Published: 1927
Place of publication: London; New York [etc.]
Language: eng
Number of pages: 156
Subjects: Telephone, Automatic.