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US3706347A
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Pipe handling system for use in well drilling
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US3670815A
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Well packer
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US3656564A
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Apparatus for rotary drilling of wells using casing as the drill pipe
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US3623558A
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Power swivel for use with concentric pipe strings
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US3630551A
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Extensible coupling for well pipes
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US3661218A
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Drilling unit for rotary drilling of wells
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US3633690A
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Well-drilling tool
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US3579752A
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Automatic rotary slips
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US3587736A
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Hydraulic open hole well packer
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US3608932A
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Powered coupling device
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US3638988A
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Latch assembly for well tools
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US3552510A
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Apparatus for rotary drilling of wells using casing as the drill pipe
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US3552509A
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Apparatus for rotary drilling of wells using casing as drill pipe
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US3552508A
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Apparatus for rotary drilling of wells using casing as the drill pipe
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US3552507A
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System for rotary drilling of wells using casing as the drill string
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US3497001A
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Tubing anchor and drain assembly
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US3653573A
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Casing centralizer and mandrel for use in welding large diameter casing
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US3528516A
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Expansible underreamer for drilling large diameter earth bores
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US3454090A
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Well tool string
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US3467202A
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Hydraulically driven power head
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