...In contrast, drum cutters and hobs cut the entire coal wall using machines, eliminating the need to knock it off again. These methods then became popular worldwide, and chain cutters disappeared around 1970. *Some of the terminology that mentions "drum shearer" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…これに対して,ドラムカッターやホーベルは炭壁の全面を機械で切削するので,あらためて打ち落とす必要はなくなり,その後世界的に普及して,70年ころにはチェーンカッターは姿を消すに至った。 ※「drum shearer」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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