Macon Electric Coil Company
Magnet-Schultz of America, Inc.
Magnetic Laboratories, Inc.
Magnetic Technology, Incorporated
Maichl Martin
Mally Frank X.
Malmborg Floyd Leonard
Mang Helmut
Manganaro George F.
Mannesmann Tally GmbH
Manufacture Francaise d'Appareils Electriques de Mesure
Marsden John Thomas
Martus Charles
Masaki Akio
Matsuda Hisatomi
Matsumoto Norio
Mayer Endre A.
Mayer-Steuernagel Wolfgang
McBride Jeffrey E.
McBride Lvle E.