子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 241 | Pulley structure | US31481540 | 1940-01-20 | US2305730A | 1942-12-22 | O'BRIEN JAMES J; JAMES STRAD |
| 242 | Detachable truck unloader | US41848441 | 1941-11-10 | US2304249A | 1942-12-08 | ERICKSON WILMAR L |
| 243 | Utility conveyer | US34089640 | 1940-06-17 | US2271754A | 1942-02-03 | ZALE GEORGE VAN |
| 244 | Trip mechanism | US29918739 | 1939-10-12 | US2266587A | 1941-12-16 | CARLSON FRITZ O |
| 245 | Conveyer | US21678938 | 1938-06-30 | US2263458A | 1941-11-18 | GELLATLY EDWIN B |
| 246 | Conveyer | US24381038 | 1938-12-03 | US2251832A | 1941-08-05 | LEVIN NILS D |
| 247 | Chain conveyer | US22169738 | 1938-07-28 | US2178341A | 1939-10-31 | HAPMAN HENRY W |
| 248 | Photoelectric message detector | US7392436 | 1936-04-11 | US2150467A | 1939-03-14 | STAIN RAY W |
| 249 | Power transmission | US13707937 | 1937-04-15 | US2148262A | 1939-02-21 | DOE THOMAS B |
| 250 | Equalizing drive for conveyer systems | US74864334 | 1934-10-17 | US2130433A | 1938-09-20 | WEBB JERVIS B |
| 251 | Driving means for grain elevators | US7645936 | 1936-04-25 | US2072400A | 1937-03-02 | HOFER JACOB D |
| 252 | Conveyer system | US59295132 | 1932-02-15 | US2057173A | 1936-10-13 | GERRIT WAALKES |
| 253 | Conveyer system | US39593129 | 1929-09-28 | US1982102A | 1934-11-27 | HESS LLOYD D; ROBERT LIBBY CHARLES |
| 254 | Conveyer driving mechanism | US54686031 | 1931-06-25 | US1974826A | 1934-09-25 | MARSHALL LOW |
| 255 | Electrically controlled driving mechanism | US63570932 | 1932-09-30 | US1961882A | 1934-06-05 | GEORGE LAGANAS |
| 256 | Overload relief for conveyer systems | US47132430 | 1930-07-28 | US1938720A | 1933-12-12 | PREBLE NORMAN H |
| 257 | Conveyer, escalator, and the like | US59891432 | 1932-03-15 | US1904068A | 1933-04-18 | HARPER MEACOCK JOHN |
| 258 | Conveyer system | US58347931 | 1931-12-28 | US1903488A | 1933-04-11 | HARRY STIBBS |
| 259 | Conveyer guide | US49129630 | 1930-10-25 | US1873456A | 1932-08-23 | MORROW FRANK C |
| 260 | Cigarette-rod drive for cigarette machines | US40416829 | 1929-11-01 | US1824391A | 1931-09-22 | BRONANDER WILHELM B |
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