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I don't see a substantial difference between this part and a standard banana jack. For example -

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Versus USD651568

enter image description here

The purpose of this part is to act as an insulator around a banana socket. But these have been around for decades.

How was this patent issued?

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This is a design patent. Design patents are not for inventions, but for a unique look or styling. Relevant prior art would be a female connector that looked like this.

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