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石川 洸, 村上 充, 塩谷 忠英, 平塚 貞人. "球状黒鉛鋳鉄の溶湯性状と引張強さに及ぼす溶湯保持時間の影響." Zenkoku koen taikai koen gaiyoshu 177.0 (2021) 43-43