| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 181 | Tractor hitch | US30690639 | 1939-11-30 | US2247534A | 1941-07-01 | VON SCHLEGELL FREDERICK |
| 182 | Harrow | US33722940 | 1940-05-25 | US2240147A | 1941-04-29 | SCARLETT ARTHUR A |
| 183 | Intergeared offset disk harrow | US21643D | USRE21643E | 1940-12-03 | ||
| 184 | Offset disk harrow | US31202840 | 1940-01-02 | US2221461A | 1940-11-12 | SJOGREN OSCAR W; GEROLD GEORGE E |
| 185 | Offset disk harrow | US10364136 | 1936-10-02 | US2196485A | 1940-04-09 | WHITE CHARLES H |
| 186 | Hitch for offset harrows | US16922037 | 1937-10-15 | US2164210A | 1939-06-27 | JOHNSON ARNOLD E W |
| 187 | Disk harrow | US1400035 | 1935-04-01 | US2152928A | 1939-04-04 | SJOGREN OSCAR W; MITCHELL ROLLIE H |
| 188 | Disk harrow with right and left turning mechanism | US73877334 | 1934-08-07 | US2005225A | 1935-06-18 | FURRER SAMUEL S |
| 189 | Disk harrow | US60868932 | 1932-05-02 | US1951912A | 1934-03-20 | HOFFMAN JOHN E |
| 190 | Offset disk harrow | US51041031 | 1931-01-22 | US1919080A | 1933-07-18 | STEWART JAMES S |
| 191 | Detent mechanism for disk cultivators | US46285130 | 1930-06-21 | US1832021A | 1931-11-17 | HAND FREDERICK E |
| 192 | Centralizing draft connection for agricultural vehicles | US39602929 | 1929-09-30 | US1830993A | 1931-11-10 | FURRER SAMUEL S |
| 193 | Wheeled harrow frame adjustment | US40904429 | 1929-11-22 | US1812904A | 1931-07-07 | SMITH EDWARD M |
| 194 | Wheeled-harrow frame adjustment | US29033828 | 1928-07-05 | US1757956A | 1930-05-13 | FLATLEY JOHN H; HOY FRED C |
| 195 | Harrow | US45539621 | 1921-03-25 | US1710124A | 1929-04-23 | TRAPHAGEN HARRY R |
| 196 | Harrow | US34496319 | 1919-12-15 | US1704339A | 1929-03-05 | RAY CHARLES T |
| 197 | Truck for disk cultivators | US3234825 | 1925-05-23 | US1619904A | 1927-03-08 | ARNOLD WENNDT |
| 198 | Disk cultivator | US71263924 | 1924-05-12 | US1619208A | 1927-03-01 | ROBERT KILLEFER |
| 199 | Cultivator frame | US55953622 | 1922-05-09 | US1611358A | 1926-12-21 | MILLER AUSTIN E |
| 200 | Gang-adjusting device for harrows | US33609019 | 1919-11-06 | US1472515A | 1923-10-30 | DICKINSON HARRY S |
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