| http://www.w3.org/ns/prov#value | - ting combustible gases in said combustion zone, a restricted lower outlet for passage of heated gases, and a cooling fluid annulus surrounding said chamber and having passages leading to 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 conduit means extendi
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