申请人 |
IDEMITSU PETROCHEMICAL CO. LTD.;NGK SPARK PLUG CO. LTD. |
发明人 |
ITO, TOSHIMICHI IDEMITSU PETROCHEMICAL COMPANY;TSUBOKAWA, MASAYA IDEMITSU PETROCHEMICAL COMPANY;WATANABE, MASAKAZU NGK SPARK PLUG COMPANY LIMITED;IIO, SATOSHI NGK SPARK PLUG COMPANY LIMITED |