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US5537778A
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Security barrier apparatus
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FR2096882A1
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Impact type deep well drilling tool - with chisel shaped head - carrying tungsten carbide scrapers
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CH528664A
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Deep well drilling tool adapted for clear-ence of rock chips - in sloping holes
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CH544880A
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Churn drill bit for cable rigs - with detachable teeth and shims for gauge loss compensation
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ZA7003966B
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Lifting device for percussion drilling cuttings
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ZA7003968B
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Expandable drill bit and reamer construction
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ES380580A1
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A device to raise materials started in the course of polls. (Machine-translation by Google Translate, not legally binding)
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ES380582A1
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Perforation device for polling machines. (Machine-translation by Google Translate, not legally binding)
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US3637030A
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Composition for and method of substantially reducing pile-up of cuttings on hole bottom in cable drop drilling
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GB1260821A
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Device for lifting percussion drilling cuttings
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GB1278835A
|
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Adjustable drill unit for churn drills and the like
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US3545554A
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Drill bit with staggered teeth
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US3522852A
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Expandable drill bit and reamer construction
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US3409091A
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Percussion multi-blow gravity drill
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US3388753A
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Driving tool
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US3409095A
|
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Percussion chatter hammer drill
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US3303899A
|
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Synchronous chatter percussion hammer drill
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US3215212A
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Percussion hammer drill
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