| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 41 | Educational computing device | US11994026 | 1926-07-01 | US1720499A | 1929-07-09 | WILLIAM WALKER |
| 42 | Harrow | US75523624 | 1924-12-11 | US1703051A | 1929-02-19 | ALTGELT HERMAN E |
| 43 | Weeding attachment for harrows | US4907725 | 1925-08-08 | US1572004A | 1926-02-09 | GASKILL JESSE A |
| 44 | Agricultural implement | US30839019 | 1919-07-03 | US1489952A | 1924-04-08 | LAWSON WILLIAM C |
| 45 | Agricultural implement | US33405019 | 1919-10-28 | US1395329A | 1921-11-01 | ATON WILLIAM E; ATON WILLIE J |
| 46 | Harrow | US29680519 | 1919-05-13 | US1348830A | 1920-08-03 | HARRY GILLIS |
| 47 | Cultivator. | US1911652269 | 1911-10-02 | US1041043A | 1912-10-15 | DEKLE JOHN H |
| 48 | Road-grader. | US1912694700 | 1912-05-02 | US1035451A | 1912-08-13 | LADD SAMUEL S |
| 49 | Draft attachment for harrows. | US1910561548 | 1910-05-16 | US1011891A | 1911-12-12 | SHERARD JOHN H |
| 50 | Harrow. | US1910554826 | 1910-04-11 | US970964A | 1910-09-20 | SNOW WILLIAM J |
| 51 | Cultivator. | US1906315930 | 1906-05-09 | US949244A | 1910-02-15 | OLSSON PER |
| 52 | Cultivator. | US1908422750 | 1908-03-23 | US903676A | 1908-11-10 | COMPTON ANDREW J |
| 53 | Harrow. | US1907364871 | 1907-03-27 | US883436A | 1908-03-31 | WELLS GEORGE H |
| 54 | Cultivator. | US1905269517 | 1905-07-13 | US812678A | 1906-02-13 | PRESSLER CASWELL |
| 55 | Cultivator. | US1903179975 | 1903-11-05 | US755538A | 1904-03-22 | PORTER HARRISON B |
| 56 | Cultivator. | US1900017850 | 1900-05-24 | US664847A | 1901-01-01 | FURTICK GRANVILLE A; JUMPER LAWRENCE J |
| 57 | Weed-cutter. | US1900003317 | 1900-01-30 | US648761A | 1900-05-01 | KREIDT AUGUST |
| 58 | Rotary-disk cultivator | US622553D | US622553A | 1899-04-04 | ||
| 59 | Cultivator | US614469D | US614469A | 1898-11-22 | ||
| 60 | Combined cultivator and harrow | US601743D | US601743A | 1898-04-05 | ||
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