So as to cope with this, discharge opening 42 having throttles 41 are provided at air pipings 39. As a result, air is discharged to the outside through discharge openings 42 having throttles 41.TANAKA SHINICHI田中 慎一
MURAKAMI AKIKYO村上 晃清TAMURA MINORU田村 実IWATA TOORU岩田 徹