(under subclass 104) Mineral-oil vaporizers having tubes or legs projecting from the main body of the vaporizer down into the furnace, the ends of the tubes so projecting being closed.
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107, for heating tubes one end of which is connected with a vaporizer and the other end of which is connected either with a source of supply of oil or with the vaporizer.
110, for vaporizers consisting entirely of tubular elements.
