4개의 부분, 함께 붙여져서
CAD 모형:
https://cad.onshape.com/documents/841ac78b5130b0b2708a7109/w/418d48fb317b9dffb41e2527/e/f111d9d5fadbcaf2e4770d9f?renderMode=0&uiState=6570db5f15a438445618ca4b
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