Well completion and improvement services, namely, hydraulic fracturing of subsurface geologic formations to enhance well production

hydraulically-operated hydrocarbon well fracturing tool, namely, downhole tubing string with valves for selectively shifting sleeves to open hydraulic fracturing ports in the downhole tubing string, packer, tool for shifting the sleeves and tool for retrieving the valves

hydrocarbon well fracturing tools, namely, downhole tubing strings with selectively openable ports and power-operated fracturing pumps

MULTIPROGRAMMABLE IMPLANTABLE NEUROSTIMULATOR DEVICE

ELECTRICAL AND ELECTRONIC MUSCLE STIMULATORS FOR PHYSICAL THERAPY, REHABILITATION, SPORTS MEDICINE AND CHIROPRACTIC