E21B 4/08
Down-hole impacting means, e.g. hammers impact being obtained by gravity only, e.g. with lost-motion connection
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Edits on 16 Mar, 2022
Golden AI
Edits on 5 Mar, 2022
Golden AI
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E21B 4/08
Down-hole impacting means, e.g. hammers impact being obtained by gravity only, e.g. with lost-motion connection
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