RU2030277C1 SU4642221A RU2030277C1 RU 2030277 C1 RU2030277 C1 RU 2030277C1 SU 4642221 A SU4642221 A SU 4642221A RU 2030277 C1 RU2030277 C1 RU 2030277C1 Authority RU Russia Prior art keywords machine tool spindle bracket unit plate Prior art date Application number Other languages English (en) Inventor