Principles and practice of telephony...
By: by Jay G. Mitchell.
Edition: 1st ed.
Publisher: McGraw-Hill book company, inc.
Published: 1923
Place of publication: New York [etc.]
Language: eng
Subjects: Telephone.
Table of contents: title: Contents.-Principles and apparatus.-Circuit elements and power plants.-Toll equipment, traffic and trunking.-Circuit refinements and mechanical switching.-Mechanical manual switching.