| http://www.w3.org/ns/prov#value | - et in a second coil and forming a porous barrier for the passage of hot gases laterally therethrough to heat such fluid by flow over said fins and tubing; said heater also including means for continuously 6 providing heated gas within the interior of said matrix, and exhaust means arranged to cause said heated gas to flow substantially only outwardly between the coil turns of said matrix at approx
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