<titlePart> <text>SECTION F <emdash/> MECHANICAL ENGINEERING</text> </titlePart> <titlePart> <text>LIGHTING</text> </titlePart> <titlePart> <text>HEATING</text> </titlePart> <titlePart> <text>WEAPONS</text> </titlePart> <titlePart> <text>BLASTING</text> </titlePart> <titlePart> <text>LIGHTING</text> </titlePart> <titlePart> <text>HEATING</text> </titlePart> <titlePart> <text>HEATING</text> </titlePart> <titlePart> <text>RANGES</text> </titlePart> <titlePart> <text>VENTILATING</text> <entryReference>protecting<NBSP/><GREF GLOBAL="" REFID="PLANT">plants</GREF> by heating in gardens, orchards, or forests<sref ref="A01G0013060000"/></entryReference> <entryReference>baking ovens and<NBSP/><GREF GLOBAL="" REFID="APPARATU">apparatus</GREF><sref ref="A21B"/></entryReference> <entryReference>cooking devices other than ranges <sref ref="A47J"/></entryReference> <entryReference>forging <sref ref="B21J"/>, <sref ref="B21K"/></entryReference> <entryReference>specially adapted for vehicles, <u>see</u> the relevant subclasses of classes <mref ref="B60" endRef="B64"/></entryReference> <entryReference>combustion<NBSP/><GREF GLOBAL="" REFID="APPARATU">apparatus</GREF> in general<sref ref="F23"/></entryReference> <entryReference>drying <sref ref="F26B"/></entryReference> <entryReference>ovens in general <sref ref="F27"/></entryReference> <entryReference>electric heating elements or arrangements <sref ref="H05B"/></entryReference> </titlePart> In this class, the following terms are used with the meanings indicated: "stove" includesapparatus which may have an open fire, e.g. fireplace; "range" means anapparatus for cooking having elements that perform different cooking operations or cooking and heating operations. <titlePart> <text>PRODUCTION OR USE OF HEAT NOT OTHERWISE PROVIDED FOR</text> <entryReference><GREF GLOBAL="" REFID="MATERIAL">materials</GREF> therefor<sref ref="C09K0005000000"/></entryReference> <entryReference><GREF GLOBAL="" REFID="ENGIN">engines</GREF> or other mechanisms for producing mechanical power from heat,<u>see</u> the relevant classes, e.g. <sref ref="F03G"/> for using natural heat</entryReference> </titlePart> Processes using enzymes or micro-organisms in order to: liberate, separate or purify a pre-existing compound or composition, or to treat textiles or clean solid surfaces ofmaterials are further classified in subclass . <titlePart> <text><GREF GLOBAL="" REFID="APPARATU">Apparatus</GREF> or devices using heat produced by exothermal chemical reactions other than by combustion</text> <entryReference>for cooking-vessels <sref ref="A47J0036280000"/></entryReference> <entryReference>self-heating compresses <sref ref="A61F0007030000"/></entryReference> <entryReference><GREF GLOBAL="" REFID="MATERIAL">materials</GREF> for the production of heat or cold undergoing non-reversible chemical reactions, other than by combustion, when used<sref ref="C09K0005180000"/></entryReference> </titlePart> <titlePart> <text>Use of solar heat, e.g. solar heat collectors</text> <entryReference>distillation or evaporation of water using solar energy <sref ref="C02F0001140000"/></entryReference> <entryReference>roof covering<NBSP/><GREF GLOBAL="" REFID="ASPECT">aspects</GREF> of energy collecting devices<sref ref="E04D0013180000"/></entryReference> <entryReference>devices for producing mechanical power from solar energy <sref ref="F03G0006000000"/></entryReference> <entryReference>semi-conductor devices specially adapted for converting solar energy into electrical energy <sref ref="H01L0025000000"/>, <sref ref="H01L0031000000"/></entryReference> <entryReference>semiconductor devices including arrays of solar cells using heat energy <sref ref="H01L0031058000"/></entryReference> <entryReference>generators in which light radiation is directly converted into electrical energy <sref ref="H02N0006000000"/></entryReference> </titlePart> <titlePart> <text>Solar heat collectors with support for article heated, e.g. stoves, ranges, crucibles, furnaces or ovens using solar heat</text> </titlePart> <titlePart> <text>Solar heat collectors having working fluid conveyed through collector</text> </titlePart> <titlePart> <text>surrounded by a transparent enclosure, e.g. evacuated solar collectors</text> </titlePart> <titlePart> <text>having concentrating elements</text> <entryReference>optical elements or systems <u>per se</u><sref ref="G02B"/></entryReference> </titlePart> <titlePart> <text>Receivers working at high temperature, e.g. for solar power<NBSP/><GREF GLOBAL="" REFID="PLANT">plants</GREF></text> </titlePart> <titlePart> <text>having lenses as concentrating elements</text> </titlePart> <titlePart> <text>having reflectors as concentrating elements</text> </titlePart> <titlePart> <text>parabolic</text> </titlePart> <titlePart> <text>hemispherical</text> </titlePart> <titlePart> <text>semi-cylindrical or cylindro-parabolic</text> </titlePart> <titlePart> <text>conical</text> </titlePart> <titlePart> <text>having flat plates</text> </titlePart> <titlePart> <text>spaced, opposed interacting reflecting surfaces</text> </titlePart> <titlePart> <text>the working fluid being conveyed between plates</text> </titlePart> <titlePart> <text>having extended surfaces, e.g. protrusions, corrugations</text> <entryReference><sref ref="F24J0002280000"/> takes precedence</entryReference> </titlePart> <titlePart> <text>the working fluid trickling freely over collector elements</text> </titlePart> <titlePart> <text>the working fluid being conveyed through tubular heat absorbing conduits</text> </titlePart> <titlePart> <text>having extended surfaces, e.g. protrusions</text> <entryReference><sref ref="F24J0002280000"/> takes precedence</entryReference> </titlePart> <titlePart> <text>having permeable mass, foraminous or porous<NBSP/><GREF GLOBAL="" REFID="MATERIAL">materials</GREF></text> </titlePart> <titlePart> <text>with means to exchange heat between plural fluids</text> </titlePart> <titlePart> <text>having evaporator and condenser section, e.g. heat pipe</text> </titlePart> <titlePart> <text>having heat storage mass</text> </titlePart> <titlePart> <text>Rollable or foldable collector units</text> </titlePart> <titlePart> <text>employing tracking means</text> <entryReference><sref ref="F24J0002020000"/>, <sref ref="F24J0002060000"/> take precedence</entryReference> <entryReference>rotary supports or mountings therefor <sref ref="F24J0002540000"/></entryReference> <entryReference>direction-finders for determining the direction from which electromagnetic waves are being received <sref ref="G01S0003780000"/></entryReference> <entryReference>control of position or direction <sref ref="G05D0003000000"/></entryReference> </titlePart> <titlePart> <text>Control arrangements</text> </titlePart> <titlePart> <text>Solar heat systems not otherwise provided for</text> </titlePart> <titlePart> <text>having thermosiphonic circulation</text> </titlePart> <titlePart> <text>Component parts, details or accessories of solar heat collectors</text> </titlePart> <titlePart> <text>characterised by the absorber<NBSP/><GREF GLOBAL="" REFID="MATERIAL">material</GREF></text> </titlePart> <titlePart> <text>Transparent coverings</text> </titlePart> <titlePart> <text>Thermal insulation</text> <entryReference><sref ref="F24J0002500000"/> takes precedence</entryReference> </titlePart> <titlePart> <text><GREF GLOBAL="" REFID="ARRANGEMENT_OF">Arrangement of</GREF> mountings or supports</text> </titlePart> <titlePart> <text>specially adapted for rotary movement</text> </titlePart> <titlePart> <text>Other production or use of heat, not derived from combustion</text> <entryReference>use of solar heat <sref ref="F24J0002000000"/></entryReference> </titlePart> <titlePart> <text>using natural heat</text> </titlePart> <titlePart> <text>using geothermal heat</text> <entryReference>devices for producing mechanical power from geothermal energy <sref ref="F03G0004000000"/></entryReference> </titlePart>