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US3228348A
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Method of and apparatus for constructing a fluid end of a reciprocating pump
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US3161259A
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Telescoping substructure for drilling rigs
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US3033530A
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Feed control device for drilling rig drums
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US3131586A
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Mechanism for making up and breaking out screw threaded joints of drill stem and pipe
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US3101828A
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Safety stop for the traveling block of drilling rigs
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US3106023A
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Magnetically attachable micrometer unit
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US3033527A
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Portable rig, mast and substructure
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US3033528A
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Combination vehicle and drilling rig drive
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US3011609A
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Fluid pressure actuated clutch mechanism for catheads and the like
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US3016992A
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Stabilizer for fluid cylinder plungers of high slenderness ratio
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US2944790A
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Drum wassembly
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US2928505A
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Brake system for hoisting drums
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US2912882A
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Multi-speed transmission cases
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US2924121A
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Universal shaft drive compound for rotary drilling rigs
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US2936654A
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Universal shaft connected compound for rotary drilling rigs
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US2944756A
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Resilient facings for drum flanges
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US2926766A
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Engine compounds for drilling rigs
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US3033124A
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Mud pumps
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US2956510A
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Alarm signals for mud pumps
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US2886876A
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Apparatus for molding concrete building slabs
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