coal fired cyclone coal mill

US3199476A US276863A US27686363A US3199476A US 3199476 A US3199476 A US 3199476A US 276863 A US276863 A US 276863A US 27686363 A US27686363 A US 27686363A US 3199476 A US3199476 A US 3199476A Authority US United States Prior art keywords fuel furnace air conduit combustion Prior art date 1963-04-30 Legal status (The legal status is an assumption and is not a

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