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 | Latching device | US18998427 | 1927-05-09 | US1704558A | 1929-03-05 | CONAWAY ERNEST A |
| 242 | Spark and weather strip | US24854928 | 1928-01-21 | US1697108A | 1929-01-01 | CONRAD DAVID E; BALDWIN VAN V |
| 243 | Door-operating mechanism | US1879125 | 1925-03-27 | US1683464A | 1928-09-04 | HENRICKS HAROLD H |
| 244 | Closure for door openings | US73580424 | 1924-09-04 | US1545551A | 1925-07-14 | COMEE JOSEPH F; KLOHS SAM F |
| 245 | Latching mechanism | US75793624 | 1924-12-24 | US1533621A | 1925-04-14 | TOBIN KENNETH J; DARROW WILLIAM W |
| 246 | Door-locking mechanism | US50419021 | 1921-09-29 | US1500169A | 1924-07-08 | WALKER CHARLES I |
| 247 | Car-door lock | US55059722 | 1922-04-08 | US1456611A | 1923-05-29 | FRITTS JAMES C |
| 248 | Car-door construction | US40907820 | 1920-09-09 | US1430555A | 1922-10-03 | FRANK JAGER |
| 249 | Steel-grain-car door | US23342718 | 1918-05-09 | US1328214A | 1920-01-13 | GEORGE TOWNILL; PETER TOWNILL |
| 250 | Trap-door for railway-car platforms. | US19609217 | 1917-10-11 | US1248806A | 1917-12-04 | CHAFFEE EDWARD F |
| 251 | Trap-door for railway-car platforms. | US2942015 | 1915-05-20 | US1246880A | 1917-11-20 | CHAFFEE EDWARD F |
| 252 | Trap-door for railway-car platforms. | US4152915 | 1915-07-23 | US1214756A | 1917-02-06 | CHAFFEE EDWARD F |
| 253 | Trap-door for railway-cars and similar structures. | US1910585703 | 1910-10-06 | US1174119A | 1916-03-07 | CHAFFEE EDWARD F |
| 254 | Car-door device. | US1170656D | US1170656A | 1916-02-08 | MARTINEAU WILLIAM C; MARTINEAU CLARENCE R | |
| 255 | Car-door. | US2513915 | 1915-05-01 | US1159550A | 1915-11-09 | THOMPSON GEORGE |
| 256 | Trap-door for railway-car platforms. | US1518915 | 1915-03-18 | US1140951A | 1915-05-25 | CHAFFEE EDWARD F |
| 257 | Trap-door for railway-car platforms. | US1912679660 | 1912-02-24 | US1119784A | 1914-12-01 | AXE ROY T |
| 258 | Extensible platform for railway-cars. | US1914826568 | 1914-03-23 | US1095741A | 1914-05-05 | SICKELS ELLWOOD H |
| 259 | Car-door seal. | US1913750534 | 1913-02-25 | US1078557A | 1913-11-11 | RUMSEY JAMES W; SHEASBY WILLIAM H |
| 260 | Mail-bag lock. | US1907379404 | 1907-06-17 | US866317A | 1907-09-17 | WATT HUGH |
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