| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 301 | Earth conditioning implement | US55479731 | 1931-08-03 | US1899306A | 1933-02-28 | BOTNEN GLENN R |
| 302 | Land leveler | US62611532 | 1932-07-29 | US1894871A | 1933-01-17 | IVERSON JOSEPH L |
| 303 | Land leveling machine | US54763431 | 1931-06-29 | US1884078A | 1932-10-25 | MIGNERY HERBERT C |
| 304 | Land leveler | US53902231 | 1931-05-21 | US1864042A | 1932-06-21 | FISHER WILLIAM E |
| 305 | Road and field conditioning device | US30298828 | 1928-08-30 | US1779548A | 1930-10-28 | FREDERICK LAGE |
| 306 | Ground packer | US31433728 | 1928-10-23 | US1738731A | 1929-12-10 | SAYRE CHARLES E |
| 307 | Drag for irrigation ditches | US25196028 | 1928-02-04 | US1727253A | 1929-09-03 | SEVERANCE ABEL W |
| 308 | Hinged-drag drawbar | US9724126 | 1926-03-25 | US1663108A | 1928-03-20 | BESSMAN FRANK A; EMIL WARMBIER |
| 309 | Ditch filler and levee leveler | US16929827 | 1927-02-18 | US1656603A | 1928-01-17 | PALMBUSH ANDREW H |
| 310 | Clod-crushing and soil-pulverizing attachment for agricultural machines | US16318527 | 1927-01-24 | US1651043A | 1927-11-29 | SAWYERS JOHN S |
| 311 | Grubber or cultivator | US1099825 | 1925-02-24 | US1640811A | 1927-08-30 | KARL SPITZENBERG GEORG |
| 312 | Land leveler | US6757625 | 1925-11-07 | US1595215A | 1926-08-10 | NORWOOD JOHN W |
| 313 | Land leveler and packer | US8037426 | 1926-01-09 | US1594265A | 1926-07-27 | GUST JOHNSON |
| 314 | Lister | US9057926 | 1926-02-25 | US1593475A | 1926-07-20 | SMITH CHARLIE L |
| 315 | Scraper attachment | US64455023 | 1923-06-11 | US1583289A | 1926-05-04 | HACKLEY PHILIP B |
| 316 | Pulverizer | US65998223 | 1923-08-29 | US1548395A | 1925-08-04 | TARBELL GROVE S |
| 317 | Drag for lawn dressings | US70136024 | 1924-03-24 | US1530329A | 1925-03-17 | ROBERTS EDWARD G |
| 318 | Land scraper | US56351022 | 1922-05-25 | US1525345A | 1925-02-03 | WARD RUFUS L |
| 319 | Drag shoe | US64707123 | 1923-06-22 | US1524324A | 1925-01-27 | WHEELER TYLER LORING |
| 320 | Ground-treating implement | US51961521 | 1921-12-03 | US1424857A | 1922-08-08 | ALBERT SPRAGUE |
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