Heaters, namely, finned tubular heaters used for heating air and select gases in forced convection and natural convection applications in hazardous environments or where mechanical damage may occur, all featuring explosive-resistant, metal-sheathed heating element construction; and commercial heating systems, consisting of electric heating components in the nature of stainless steel fins continuously wound and brazed onto the sheath, electric heaters, thermostatic controls, control panels, and temperature sensors, all sold as a unit, and all featuring explosive-resistant, metal-sheath heating element construction

'air':9 'applic':19 'braze':59 'commerci':41 'compon':48 'consist':44 'construct':39,88 'continu':56 'control':66,67 'convect':15,18 'damag':26 'electr':46,63 'element':38,87 'environ':22 'explos':32,81 'explosive-resist':31,80 'featur':30,79 'fin':3,55 'forc':14 'gase':12 'hazard':21 'heat':8,37,42,47,86 'heater':1,5,64 'may':27 'mechan':25 'metal':35,84 'metal-sheath':34,83 'name':2 'natur':17,51 'occur':28 'onto':60 'panel':68 'resist':33,82 'select':11 'sensor':71 'sheath':36,62,85 'sold':73 'stainless':53 'steel':54 'system':43 'temperatur':70 'thermostat':65 'tubular':4 'unit':76 'use':6 'wound':57

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