Earth drilling equipment wood engravings published in 1893 Earth drilling equipment 1 Earth auger for soft masses 2 Drill bits for dense rock 3 Kind s freefall drill 4 Spoon with a ball valve 5 Derrick at Passy Paris France 6 I scissors grab II Fabian s freefall drill IIa well IIb wad hook III borehole protected by pipes
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