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drill head for drill rod of earth drilling device, has central area with

Drill Rod Of Earth Drilling Device, Has Central Area With Diameter Gradually Decreasing From Central Part Towards Drilling Head Tip And Drilling Top End, And Cylindrical Sect

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Core drill set-

Dth Drilling Accessories:4 Inch Hammer Model Prv 4 Back Head 23/8 Inch Api Rock Drilling Or Earth Boring Tools Othe R Including Parts Aw Drill Rod With C

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The clamping head (1) has a sleeve (3) which is provided on a drill rod (5). The drill rod g of the hollow shaft. An independent claim is included for earth oil well drilling installation.

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Wood wasp inspired planetary and earth drill -

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penetration of members such as drill rods, etc. Two pairs of rotating eccentric masses a 1. A sine generator drill head including an outer housing, a spindle having a first axis, sa