採炭切羽に於ける地壓統制に關する2, 3の考察
1941 年 57 巻 680 号 p. 727-737
詳細
1941 年 57 巻 680 号 p. 727-737
From the results of some experimental investigations which were made at Sinhoronai-Colliery and Ytibari-Colliery, auther discussed the method of roof control at long wall works and deduced some conclusions about it.
