| http://www.w3.org/ns/prov#value | - of gases in said combustion zone for ignition, a restricted lower outlet for passage of heated gases, and a cooling fluid annulus surrounding said chamber, said annulus being in fluid communication with said chamber, means including conduit means extending from the surface, for supplying fuel from the surface to said inlet end of said gas generator located in said borehole, means, including condui
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