4. Gas separation
  5. Plural serial basically diverse separating media
  6. Plural stages in unitary casing

Sung-tae Joo

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Cyclone-type dust-collecting apparatus for use in a vacuum...

Gas separation – Plural serial basically diverse separating media – Plural stages in unitary casing
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Suction brush assembly having rotation roller for sweeping dust

Brushing – scrubbing – and general cleaning – Machines – With air blast or suction
Reexamination Certificate

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