Index of patents relating to electricity
Subtitle: embracing patents issued by the United States Patent Office from July 1, 1889, to June 30, 1890 : appendix no. IX
By: compiled under the direction of the Commissioner of Patents
Publisher: G.P.O.
Published: 1891
Place of publication: Washington
Language: eng
Number of pages: 29
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.

NMAH copy 39088000449173 number 8 in v. with binder's title: Index of patents relating to electricity.