Double insulated drill tests
Contributors: Helfrich, William J.; Reynolds, Richard L.
Series: MSHA informational report -- 1081; Informational report (United States. Mine Safety and Health Administration) -- 1081.
Publisher: Dept. of Labor, Mine Safety and Health Administration
Published: 1978
Place of publication: [Washington]
Language: eng
Number of pages: 28
Subjects: Mining machinery; Testing; Boring machinery
Notes: Prepared by William J. Helfrich and Richard L. Reynolds.