4. Acoustics
  5. Sound-modifying means
  6. Muffler, fluid conducting type

M.D. Manufacturing, Inc.

Corporate Assignee

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Apparatus for dampening the noise of a vacuum cleaner

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

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Built-in vacuum cleaning system with improved acoustic damping d

Acoustics – Sound-modifying means – Muffler – fluid conducting type
Patent

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