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Groundwater - Stone hammer well drilling

No change in size, 11:40, 28 July 2007
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! style="background:#ffdead;" | Disadvantages
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| valign="top" | Cheaper and easyer easier to maintain than motorized drilling rigs.<br>
Drill in very hard soil<br>
| valign="top" | Slower than motorized drilling rigs.<br>
Akvouser
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