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Class Information
Number: 175/298
Name: Boring or penetrating the earth > Below-ground (1) hammer, or (2) impact members > Continuous unidirectional rotary motion of one telescoping member effects consecutive impacts
Description: Apparatus in which the telescoping members are provided with means which cooperate to cause repetitive reciprocation of said members relative to each other when one member is continuously turned in the same direction about its axis.
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| 5873579 |
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| 5318140 |
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| 5305837 |
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| 4890682 |
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| 4576229 |
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| 4558749 |
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| 4408670 |
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Oct. 11, 1983 |
| 4289210 |
Impact drill bit actuator |
Sep. 15, 1981 |
| 4279315 |
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Jul. 21, 1981 |
| 4253531 |
Self-balancing vibratory drill apparatus |
Mar. 3, 1981 |
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