| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 321 | Leveler | US38056320 | 1920-05-11 | US1397784A | 1921-11-22 | ROPP JOHN F |
| 322 | Bog-cutter, grubber, and weeder | US46048121 | 1921-04-11 | US1392900A | 1921-10-11 | ALBERT AMBROSE CHARLES |
| 323 | Harrow | US22356018 | 1918-03-20 | US1383942A | 1921-07-05 | HARRIS JAMES W |
| 324 | Clod-crusher and leveler | US34238419 | 1919-12-04 | US1365287A | 1921-01-11 | SMIDLEY GEORGE W |
| 325 | Combined plow and scraper | US29552919 | 1919-05-08 | US1356036A | 1920-10-19 | BUCKLEY GEORGE A |
| 326 | Brush-cutter and ground-evener | US30989419 | 1919-07-10 | US1346382A | 1920-07-13 | FRANK POMIJE |
| 327 | Land-scraper or leveling-machine | US31037119 | 1919-07-12 | US1343159A | 1920-06-08 | BARNEY SANDSTROM |
| 328 | Land-leveling machine | US28172119 | 1919-03-10 | US1337355A | 1920-04-20 | GHENT GEORGE A |
| 329 | Sage-brush grubber | US32335719 | 1919-09-12 | US1331731A | 1920-02-24 | VANCIL WILLIAM N |
| 330 | Solvie s | US1318419D | US1318419A | 1919-10-14 | ||
| 331 | Attachment for cultivators | US1318144D | US1318144A | 1919-10-07 | ||
| 332 | Combined road scraper and drag. | US15750917 | 1917-03-26 | US1243329A | 1917-10-16 | MITTENDORF EDWARD F |
| 333 | Cultivator. | US8193416 | 1916-03-03 | US1241382A | 1917-09-25 | HOWARD QUINTON S |
| 334 | Land-leveler. | US10937216 | 1916-07-14 | US1239058A | 1917-09-04 | STANDLEY JOHN M |
| 335 | Cultivator. | US9167316 | 1916-04-17 | US1217776A | 1917-02-27 | KIMBRIEL ISHAM S |
| 336 | Weed-cutter. | US8116016 | 1916-02-29 | US1214383A | 1917-01-30 | SIGURD CARL G |
| 337 | Gage attachment for planters. | US8955116 | 1916-04-07 | US1209430A | 1916-12-19 | GREIMANN BENJAMIN F |
| 338 | Gang-plow. | US4988015 | 1915-09-10 | US1201644A | 1916-10-17 | SCHNEIDER FREDERICK J |
| 339 | Weed-cutter. | US2242615 | 1915-04-19 | US1201589A | 1916-10-17 | JOHNSON SAMUEL |
| 340 | Chain harrow. | US491015 | 1915-01-28 | US1198533A | 1916-09-19 | GLERUM INGEBRIGT J |
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