Telephone service.
By: June 24, 1921.
Series: Circular of the Bureau of Standards ;; no. 115
Publisher: Govt. Print. Off.
Published: 1921
Place of publication: Washington
Language: eng
Number of pages: 214
Subjects: Telephone.
Notes: S.W. Stratton, director.
Most plates printed on both sides.
"Development of the telephone industry" : p. 204-208.