Mandel Bros.

MarchFirst Inc. (see Whittman-Hart Inc. )

Marcor Inc. (see Ward (Montgomery) & Co. )

Marmon Group Inc.

Material Service Corp.

Mayer (Oscar) & Co.

Mayer, Brown & Platt

McCormick Harvesting Machine Co. (see International Harvester Co. )

McGraw-Edison Co.

Mears, Bates & Co.

Meister Brau, Inc. (see Hand (Peter) Brewing Co. )

Midas International Corp. (see IC Industries Inc. )

Midway Airlines Inc.

Molex Inc.

Morris (Nelson) & Co.

Morrison, Plummer & Co.

Morton Salt Co.

Munger, Wheeler & Co.

Munn & Scott