US PATENT SUBCLASS 65 / 523
.~.~.~ With at least two concentric blowers or burners

Current as of: June, 1999
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65 /   HD   GLASS MANUFACTURING

483  DF  FIBER MAKING APPARATUS {21}
521  DF  .~ Centrifuge with fiberizing holes (e.g., rotor, etc.) {1}
522  DF  .~.~ Having adjacent combustion chamber, burner, or blower utilized {1}
523.~.~.~ With at least two concentric blowers or burners

DEFINITION

Classification: 65/523

With at least two concentric blowers or burners:

(under subclass 522) Apparatus wherein more than one burner or blower sharing a common center is used.