American Standard Safety Code for Installing and Using Electrical Equipment in and about Coal Mines (M2.1): Revision of American Standard Safety Rules for Installing and Using Electrical Equipment in Coal Mines, M2-1926, Issues 508-518
American Standards Association · Forrest Theodore Moyer · Ned H. Snyder · Russell Everett Morgan · Simon Harry Ash · G. D. Jones · John Ferdinand Barkley · Sebastian J. Aresco · W. L. Eaton · Ralph H. Whaite · Virginia E. Wrenn
Jan 1951 · U.S. Government Printing Office