| 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 | Polished rod clamps | US3538559D | 1968-10-14 | US3538559A | 1970-11-10 | RIVES JOE FRANK |
| 242 | Hydraulic pipe clamp | US3517961D | 1967-12-18 | US3517961A | 1970-06-30 | JOHNSON GLENN D |
| 243 | Polish rod grip clamp | US3475798D | 1967-12-08 | US3475798A | 1969-11-04 | CRICKMER CHARLES D |
| 244 | Safety collar | US24309051 | 1951-08-22 | US2719025A | 1955-09-27 | STONE ALBERT L |
| 245 | Polish rod clamp | US2260544D | US2260544A | 1941-10-28 | ||
| 246 | Wire line clamp | US23567538 | 1938-10-18 | US2183904A | 1939-12-19 | BELL THOMAS W; ROGERS THOMAS C |
| 247 | Clamp | US12135137 | 1937-01-19 | US2136861A | 1938-11-15 | AMOS NORRIS |
| 248 | Rope twisting tool | US65511133 | 1933-02-03 | US1955351A | 1934-04-17 | TENNANT SAMUEL L |
| 249 | Puller | US55346731 | 1931-07-27 | US1877684A | 1932-09-13 | WILSON NICKERSON GEORGE |
| 250 | Drill and pipe pulling machine | US31845328 | 1928-11-10 | US1855116A | 1932-04-19 | VACLAV PRAJER |
| 251 | Pipe holder for well pipes | US54773231 | 1931-06-29 | US1854573A | 1932-04-19 | ASKEW V |
| 252 | Wire liwe dh | US1835455D | US1835455A | 1931-12-08 | ||
| 253 | Well-casing lifter | US48570730 | 1930-10-01 | US1801448A | 1931-04-21 | NEELEY IRA W |
| 254 | Wire-cable clamp | US33246629 | 1929-01-14 | US1778274A | 1930-10-14 | PATTERSON OLIVER C |
| 255 | Pull-rod clamp | US36423329 | 1929-05-18 | US1768038A | 1930-06-24 | GIBSON DURNELL HAROLD; STEEL SAMUEL T |
| 256 | Rod clamp | US27004728 | 1928-04-14 | US1742302A | 1930-01-07 | BRADSHAW SAMUEL S; ALBERT MARTINDALE CHARLES |
| 257 | Pipe or rod clamp | US22443727 | 1927-10-06 | US1718072A | 1929-06-18 | QUARNSTROM OSCAR A |
| 258 | Casing clamp | US26201128 | 1928-03-15 | US1715189A | 1929-05-28 | BUTLER CHARLES A |
| 259 | Clamp | US22393627 | 1927-10-04 | US1688718A | 1928-10-23 | JONES WINFIELD S; MCLEAN ANTHONY E |
| 260 | Wire-line clamp | US17809727 | 1927-03-24 | US1686547A | 1928-10-09 | BELL THOMAS W; ROGERS THOMAS C |
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