| 其他書名 | comp. from vols. ..., incl., of the official gazette of the U.S. Patent Office during the year .... 1871, Apr. - Sept |
| 出版 | US GovernmentPrint.Office, 1871 |
| URL | http://books.google.com.hk/books?id=ycRSAAAAcAAJ&hl=&source=gbs_api |
| EBook | FULL_PUBLIC_DOMAIN |