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1. A housing apparatus of an instrument, that has a shape of a rounded rectangular prism comprising a back plate (1) that has a shape of a rounded rectangular prism without a top plate, and whose one end comprises a first output interface opening (11); a charging interface opening (12) that is disposed about the center of said one end; a second output interface opening (13); a first baffle plate that is disposed between said first output interface opening (11) and said charging interface opening (12); a second baffle plate that is disposed between said second output interface (13) and said charging interface (12); a first box-like structure that is disposed inside said housing apparatus between said first output interface opening (11) and said charging interface opening (12); wherein a partial wall of said first box-like structure and a wall of said one end of said back plate sandwich said first baffle plate and form a groove for said first baffle plate to slide within; a second box-like structure that is disposed inside said housing apparatus between said second output interface opening (13) and said charging interface opening (12); wherein a partial wall of said second box-like structure and a wall of said one end of said back plate sandwich said second baffle plate and form a groove for said second baffle plate to slide within; wherein said first box-like structure further comprises a first wall (4) and a second wall (6) opposite one another; wherein said second box-like structure further comprises a first wall (5) and a second wall (7) opposite one another; a first spring (8) that is encased in said first box-like structure; a second spring (9) that is encased in said second box-like structure.
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