7 Power-operated tools, machines and apparatus for drilling completing and producing fluids from oil, gas, condensate and water wells, well bores and bore holes, and for intervention in oil, gas, condensate and water, wells, well bores and bore holes; power-operated tools, machines and apparatus for cementing oil, gas, condensate and water wells, well bores and bore holes; power-operated down hole cementing tools for use in oil, gas, condensate and water wells, well bores and bore holes; power-operated flow control and flow circulation tools for use in oil, gas, condensate and water, wells, well bores and bore holes; oil field machines, namely, intervention packers for sealing and securing oil, gas, condensate and water wells, well bores and bore holes; oil field machines being permanent packers for sealing and securing oil, gas, condensate and water wells, well bores and bore holes; oil field machines being retrievable packers for sealing and securing oil, gas, condensate and water wells, well bores and bore holes; oil field machines being cased hole packers for sealing and securing oil, gas, condensate and water wells, well bores and bore holes; perforation cleanup straddles, namely, belts for machines for sealing and securing oil, gas, condensate and water wells, well bores and bore holes; power-operated setting tools for sealing and securing oil, gas, condensate and water wells, well bores and bore holes; parts of machines for sealing and securing oil, gas, condensate and water wells, well bores and bore holes, namely, hangers, intervention hangers, retrievable hangers, plugs, bridge plugs, high pressure plugs, slips, mechanical slips, hydraulic slips, chokes, variable chokes, and hydraulically-operated chokes; parts and fittings for the aforesaid goods