Index of patents relating to electricity
Subtitle: embracing patents issued by the United States Patent Office from July 1, 1884, to June 30, 1885 : appendix no. IV
By: compiled under the direction of the Commissioner of Patents
Publisher: G.P.O.
Published: 1886
Place of publication: Washington
Language: eng
Number of pages: 17
Subjects: Electric apparatus and appliances; Patents; Electric machinery
Notes: Appendix in three parts: (1) sub-class index, (2) numerical and chronological index, (3) alphabetical index.

Includes addenda.

NMAH copy 39088000449173 number 3 in v. with binder's title: Index of patents relating to electricity.