United States. Patent Office. (1891). Index of patents relating to electricity, embracing patents issued by U.S. Patent Office from July 1, 1889 to June 30, 1890: Appendix No. IX. GPO.
Chicago Style (17th ed.) CitationUnited States. Patent Office. Index of Patents Relating to Electricity, Embracing Patents Issued by U.S. Patent Office from July 1, 1889 to June 30, 1890: Appendix No. IX. [Washington]: GPO, 1891.
MLA (9th ed.) CitationUnited States. Patent Office. Index of Patents Relating to Electricity, Embracing Patents Issued by U.S. Patent Office from July 1, 1889 to June 30, 1890: Appendix No. IX. GPO, 1891.
Warning: These citations may not always be 100% accurate.