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 |
|---|---|---|---|---|---|---|
| 221 | Pneumatic conveyer and feeder for loose solids | US13490749 | 1949-12-24 | US2623793A | 1952-12-30 | HILL HOWARD W |
| 222 | Material distributing apparatus | US4591848 | 1948-08-24 | US2616766A | 1952-11-04 | SANBORN ARTHUR H; GIESEN ARTHUR A |
| 223 | Silo unloader | US61456445 | 1945-09-05 | US2580306A | 1951-12-25 | LEACH ELBERT C; MANTHIE OTTO F; CLAPP GEORGE D |
| 224 | Double feed ensilage blower | US56861344 | 1944-12-18 | US2410943A | 1946-11-12 | HUDDLE EDWIN F |
| 225 | Ensilage blower | US52766344 | 1944-03-22 | US2410501A | 1946-11-05 | HUDDLE EDWIN F |
| 226 | Grain blower | US60305845 | 1945-07-03 | US2406566A | 1946-08-27 | ROWLEY CECIL C; WALGREN LESLIE C |
| 227 | Pulverulent materials-handling and storage system | US52413744 | 1944-02-26 | US2374584A | 1945-04-24 | CANNON CURTIS W |
| 228 | Elevator | US44981242 | 1942-07-04 | US2373169A | 1945-04-10 | COULTAS WILBUR J; JOHNSON ELLSWORTH T; WALKER JESSE A |
| 229 | Dry cement conveyer | US37638741 | 1941-01-28 | US2272564A | 1942-02-10 | KUEVER JR PAUL H |
| 230 | Apparatus for feeding aggregate | US17867937 | 1937-12-08 | US2191096A | 1940-02-20 | MCCURDY STEWART L |
| 231 | Feed hopper for pulverized materials | US17954837 | 1937-12-13 | US2164483A | 1939-07-04 | JAMES WATSON; THOMAS LAMB HAROLD |
| 232 | Apparatus for rendering pulverulent materials fluent | US2608435 | 1935-06-11 | US2084546A | 1937-06-22 | NIKOLAI AHLMANN |
| 233 | Machine for unloading cement | US48109530 | 1930-09-11 | US1869679A | 1932-08-02 | FREDERICK ALTON K |
| 234 | Pneumatic conveyer | US31564928 | 1928-10-29 | US1842416A | 1932-01-26 | LUDWIG JOHN E |
| 235 | Pneumatic excavator and conveyer | US74002924 | 1924-09-26 | US1754507A | 1930-04-15 | FROHM HENRY A |
| 236 | Feed apparatus | US26224128 | 1928-03-16 | US1754121A | 1930-04-08 | SAMMIS DONALD S |
| 237 | Apparatus for distributing powdered material | US64173623 | 1923-05-26 | US1686256A | 1928-10-02 | VERNON ROYLE |
| 238 | Conveying apparatus | US15717926 | 1926-12-27 | US1670383A | 1928-05-22 | SCHAEFFER CHARLES M |
| 239 | Exhaust fan | US12844226 | 1926-08-10 | US1627608A | 1927-05-10 | KEENEY CHARLES H |
| 240 | Portable pneumatic elevating device | US59510422 | 1922-10-17 | US1619277A | 1927-03-01 | THIEMANN WILLIAM B |
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