| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 161 | Drill bit | US60915022 | 1922-12-26 | US1502463A | 1924-07-22 | DUNSWORTH GEORGE W |
| 162 | Rotary rock drill | US52982022 | 1922-01-17 | US1467479A | 1923-09-11 | JOSEPH HENRITZI |
| 163 | Well drill | US46821421 | 1921-05-10 | US1456158A | 1923-05-22 | TUNNELL JESSE F |
| 164 | Underreamer | US48081921 | 1921-06-27 | US1420918A | 1922-06-27 | FEHLMAN BERNARD F |
| 165 | Earth-boring apparatus | US42965020 | 1920-12-10 | US1410674A | 1922-03-28 | HENRY HERMAN JOHN |
| 166 | Underreamer | US31963619 | 1919-08-25 | US1372917A | 1921-03-29 | FRED SWAN |
| 167 | Underreamer | US37493520 | 1920-04-19 | US1362513A | 1920-12-14 | SKINNER CHARLES P |
| 168 | Underreamer | US37132020 | 1920-04-05 | US1350765A | 1920-08-24 | WRIGHT CLYDE S |
| 169 | Drilling-bit | US29897819 | 1919-05-22 | US1347774A | 1920-07-27 | BUDDINGTON THOMAS C |
| 170 | Well-boring tool | US28192819 | 1919-03-11 | US1347469A | 1920-07-20 | STEVEN TOTH |
| 171 | Drill-bit | US28097819 | 1919-03-06 | US1332105A | 1920-02-24 | CLEMENTS JR FRANK L |
| 172 | Rotary boring-drill. | US26789418 | 1918-12-23 | US1326509A | 1919-12-30 | HUMASON GRANVILLE ALLISON |
| 173 | Oil-drill. | US31305419 | 1919-07-24 | US1326327A | 1919-12-30 | DUNNING ROBSON |
| 174 | Expansive and contractive well-drill. | US21053618 | 1918-01-05 | US1271275A | 1918-07-02 | CARTER OSCAR MARTIN |
| 175 | Rotary drill. | US3929315 | 1915-07-12 | US1192419A | 1916-07-25 | HAMPTON HARRY D |
| 176 | Well-drilling bit. | US5547715 | 1915-10-12 | US1174332A | 1916-03-07 | MARNEY ROBERT A |
| 177 | Combination bit and rotary underreamer. | US6130915 | 1915-11-13 | US1169922A | 1916-02-01 | CAMPBELL LAWRENCE S; GRANT JOHN |
| 178 | Expanding well-digging bit. | US1913750905 | 1913-02-26 | US1095419A | 1914-05-05 | REAGAN CASWELL A |
| 179 | Well-drilling apparatus. | US1912738213 | 1912-12-23 | US1087353A | 1914-02-17 | DARLING JOSEPH |
| 180 | Rotary drilling apparatus. | US1911665390 | 1911-12-12 | US1068015A | 1913-07-22 | STEWART ALFRED C |
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