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A new percussion hammer mechanism for a borehole deployable..:

Makinson, Keith ; Ashurst, Daniel ; Anker, Paul G.D...
https://nora.nerc.ac.uk/id/eprint/528236/1/a-new-percussion-hammer-mechanism-for-a-borehole-deployable-subglacial-sediment-corer.pdf.  , 2021