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US Patents

Preparation of 1,2,5,6-tetra-hydro-3-carboalkoxypridines such as

Amusement devices: toys – Figure toy or accessory therefor – Including musical instrument or simulation thereof

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

I am not sure

Manufacturing base and used to stop/slow down rivals

Serves only patent trolls

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