- MARCUS MASON AND COMPANY
- MARSEILLIES HYDRO ILL POWER CO LA SALLE COUNTY ILL
- MARSEILLIES HYDRO WITH LEFFEL AND WESTINGHOUSE TURBINE-GENERATORS
- Massman
- Maxwell Paper Co Woodward Governor
- Maxwell Paper Company
- May 11 1938
- May 11 1938 2
- McCORD COMPANY 1917
- McFarlane-Eggers Machinery Co
- McFarlane-Eggers Machinery Co 001
- McFarlane-Eggers Machinery Co 001
- McFarlane-Eggers Machinery Co 002
- McFarlane-Eggers Machinery Co 002 001
- McFarlane-Eggers Machinery Co 003