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US Patents

Acoustical transducer mounting arrangement

Electrical audio signal processing systems and devices – Electro-acoustic audio transducer – Plural or compound reproducers

Patent

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How useful is this invention? - Does humanity need patent for this invention?

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Already used for thousands of years

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Bloory idea and bloory practical use

Very broad patent, without practical use

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Patented to preserve knowledge

Defensive patent

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Manufacturing base and used to stop/slow down rivals

Serves only patent trolls

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