Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) WATANABE Zenjiro,Improvement of the Performance of Rock Drill with Reaction Valve,Journal of the Mining and Metallurgical Institute of Japan,03694194,The Mining and Materials Processing Institute of Japan,1962,78,890,581-585,https://cir.nii.ac.jp/crid/1390001205982085888,https://doi.org/10.2473/shigentosozai1953.78.890_581