| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 181 | Rock drill | US70358033 | 1933-12-22 | US2081918A | 1937-06-01 | GARTIN ELMER G |
| 182 | Rock drill rifle nut and method of making same | US71333534 | 1934-02-28 | US2061807A | 1936-11-24 | WARREN NOBLE |
| 183 | Slip rotation for rock drills | US991735 | 1935-03-08 | US2052427A | 1936-08-25 | SLATCHER ALFRED G |
| 184 | Oscillatory gear | US1892135 | 1935-04-29 | US2039679A | 1936-05-05 | DORMAN BYERS FREDERICK |
| 185 | Rotation mechanism | US75817334 | 1934-12-19 | US2028252A | 1936-01-21 | SLATER FRED M |
| 186 | Rock drill | US75420334 | 1934-11-22 | US2019163A | 1935-10-29 | SLATER FRED M |
| 187 | Rotation mechanism for rock drills | US60437632 | 1932-04-11 | US2013744A | 1935-09-10 | CURTIS JOHN C |
| 188 | Fluid actuated tool | US45209930 | 1930-05-13 | US2011502A | 1935-08-13 | RENFER JOHN E; SLATCHER ALFRED G |
| 189 | Rock drill | US51752131 | 1931-02-21 | US1977636A | 1934-10-23 | CHESTER HUFFMAN MERVIN |
| 190 | Rock drill | US40353629 | 1929-10-30 | US1962684A | 1934-06-12 | GARTIN ELMER G |
| 191 | Bit rotating device for reciprocating tools | US51280031 | 1931-02-02 | US1934252A | 1933-11-07 | BAKER JAMES N |
| 192 | Rock drill | US31465728 | 1928-10-24 | US1878905A | 1932-09-20 | SMITH SR WILLIAM A |
| 193 | Fluid actuated tool | US38047829 | 1929-07-24 | US1862637A | 1932-06-14 | SLATCHER ALFRED G |
| 194 | Slip rotation for rock drills | US28751028 | 1928-06-22 | US1852339A | 1932-04-05 | SHEETS BARTON R |
| 195 | Slip rotation for rock drills | US28356128 | 1928-06-07 | US1821794A | 1931-09-01 | DOWNING EDWIN J |
| 196 | Kents | US1806874D | US1806874A | 1931-05-26 | ||
| 197 | Rotation mechanism for rock drills | US24623128 | 1928-01-12 | US1776509A | 1930-09-23 | HULSHIZER GEORGE W |
| 198 | Drilling mechanism | US64109723 | 1923-05-24 | US1761310A | 1930-06-03 | OSGOOD CHARLES F |
| 199 | Rotation mechanism for hammer drills | US66848723 | 1923-10-15 | US1713987A | 1929-05-21 | STEVENS EDWARD W |
| 200 | Hammer drill | US67366523 | 1923-11-09 | US1675326A | 1928-07-03 | BLANDING FORREST H |
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