FIELD: devices for making holes in ground. SUBSTANCE: device has hollow body, mechanism for device motion, and mechanism for changing direction of device motion. The latter has movable members, drive for extension of movable members, drive for retraction of movable members, and device for selective connection of movable members for extension. EFFECT: higher efficiency. 7 cl, 4 dwg
| Title | Year | Author | Number |
|---|---|---|---|
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