United States government master specifications for lamps, electric, incandescent, large, tungsten filament.
Edition: 11th ed.
Series: Circular of the Bureau of Standards -- no. 13 (1927)
Publisher: Government Printing Office
Published: 1927
Place of publication: Washington
Language: eng
Number of pages: 12
Subjects: Incandescent lamps -- Standards.; Incandescent lamps -- Filaments -- Standards.
Notes: "Issued December 21, 1927."

At head of title: Department of Commerce, Bureau of Standards.

"U.S. Gov't master specification no. 23b."