United States Electric Signal Co., West Newton, Mass., U.S.A.
Contributors: Louisiana Purchase Exposition (1904 : Saint Louis, Mo.)
Publisher: United States Electric Signal Co.
Published: 1904
Place of publication: West Newton, Mass
Language: eng
Other titles: Automatic block signals for street railways
Notes: Cover title.

"Our exhibit may be seen in Electricity Building, section 167, Louisiana Purchase Exposition, St. Louis"--P. [8].