- 1-in-10 Strainer Company
- 103 Degree Incubator Company
- 1900 Washer Company
- 3-in-1 Oil Company
- 3M Company
- A-1 Manufacturing Company
- A-A Wire Company
- A-B Polish Company
- A-B Stove Company
- A-C Electrical Manufacturing Company
- A-P Controls Corporation
- A-Z Company
- A. & B. Garthus Company
- A. & C. A. Hix
- A. & E. Leather Goods Company
- A. & F. Brown Company
- A. & J. Manufacturing Company
- A. & R. Lamp Company
- A. & W. Electric Sign Company
- A. A. Cooper Wagon & Buggy Company
- A. A. Cutter Company
- A. A. Griffing Iron Company
- A. A. Loetscher
- A. Allan & Son
- A. B. & B. Sheet Metal Works
- A. B. C. Castings Company
- A. B. C. Motor Vehicle Manufacturing Company
- A. B. Carlson Company
- A. B. Chase Company
- A. B. Clippinger & Son Company
- A. B. Dick Company
- A. B. Electric Company
- A. B. Ellithorpe
- A. B. Farquhar Company
- A. B. Fiedler & Sons
- A. B. Gaston Company
- A. B. Hazzard
- A. B. Jardine & Company
- A. B. Koch Company
- A. B. Ormsby Company
- A. B. Sands & Son Company
- A. B. See Elevator Company
- A. B. Smith Chemical Company
- A. B. Willoughby
- A. Berg & Sons
- A. Boake, Roberts & Company
- A. Bruns & Sons
- A. Buch's Sons Company
- A. Burlingame Company
- A. C. Barler Manufacturing Company
- A. C. Barnes Company
- A. C. Blancke & Company
- A. C. Bosselman & Company
- A. C. Brosius
- A. C. Cheney Piano Action Company
- A. C. Chesley Company
- A. C. Dallas & Son, Inc.
- A. C. Gibson Company
- A. C. Gilbert-Menzies Company
- A. C. Gilbert Company
- A. C. Layman Machine Company
- A. C. Mannweiler Company
- A. C. Norquist Company
- A. C. Penn, Inc.
- A. C. Selleck
- A. Consolidated Gasoline Engine Company
- A. D. Baker Company
- A. D. Cook, Inc.
- A. D. Joslin Manufacturing Company
- A. D. Waymoth & Company
- A. Darracq & Compagnie
- A. Dubois & Son
- A. E. Buck
- A. E. Durner
- A. E. Haskell
- A. E. Nettleton Company
- A. E. Palmer & Sons
- A. E. Putnam Company
- A. E. Rittenhouse Company
- A. E. Stevens & Company
- A. F. Carver
- A. F. Daum Company
- A. F. Gilmore Company
- A. F. Meisselbach & Bro.
- A. F. Meyer Manufacturing Company
- A. F. Schwerd Manufacturing Company
- A. G. Burton's Son, Inc.
- A. G. Cox Manufacturing Company
- A. G. Cripps Manufacturing Company
- A. G. Hebgen
- A. G. Hyde & Sons
- A. G. Lehman Company
- A. G. Liggett & Son Company
- A. G. Spaulding & Brothers
- A. G. Thurston & Son
- A. Garrison Foundry Company
- A. Geoghan & Son, Inc.
- A. H. & C. B. Alling Company
- A. H. & F. H. Lippincott, Inc.
- A. H. Andrews Company
- A. H. Berry Shoe Company
- A. H. Caplan & Company
- A. H. Corwin & Company
- A. H. Fox Gun Company
- A. H. Grebe & Company
- A. H. Green Company
- A. H. Harshbarger
- A. H. Heisey & Company
- A. H. Hews & Company
- A. H. Heyner & Company
- A. H. Lewis Company
- A. H. Lyons & Company
- A. H. Newcomb
- A. H. Nilson Machine Company
- A. H. Patch, Inc.
- A. H. Peirce Manufacturing Company
- A. H. Reid Creamery & Dairy Supply Company
- A. H. Riemer Shoe Company
- A. H. Robins Company
- A. H. Robinson Company
- A. H. Sweet & Son
- A. H. Wirz, Inc.
- A. H. Yocum Company
- A. Hall Berry
- A. Hankey & Company
- A. Hartung & Company
- A. I. Root Company
- A. J. Bates & Company
- A. J. Beatty & Sons
- A. J. Bolton Company
- A. J. Clark Manufacturing Company
- A. J. Corcoran, Inc.
- A. J. Detlaff Company
- A. J. Ditman
- A. J. Johnson & Sons Furniture Company
- A. J. Kirstin Company
- A. J. Koll Planing Mill Company
- A. J. Lindemann & Hoverson Company
- A. J. Logan Company
- A. J. Myers, Inc.
- A. J. Phillips Company
- A. J. Platt
- A. J. Rummel Arms Company
- A. J. Smart Manufacturing Company
- A. J. Tower Company
- A. J. Truitt Whip Company
- A. J. Wilkinson & Company
- A. Johnson Machine Works
- A. K. Bowman Manufacturing Company
- A. K. Robins & Company
- A. Kieckhefer Elevator Company
- A. Kimball Company
- A. Klipstein & Company
- A. Kommel & Sons
- A. Kreamer
- A. L. Dyke
- A. L. Hansen Manufacturing Company
- A. L. Henderer's Sons
- A. L. Holcomb & Company
- A. L. Ide & Sons
- A. L. Rice
- A. L. Schultz & Son
- A. L. Singer & Company
- A. L. Tribble Company
- A. L. Webb & Sons
- A. L. Werner & Company
- A. Leschen & Sons Rope Company
- A. Lewin & Son
- A. Lowy
- A. M. Byers Company
- A. M. Castle Engineering Company
- A. M. Collins Manufacturing Company
- A. M. Dellinger
- A. M. Gutterman & Sons Company
- A. M. Piper
- A. M. Ramer Company
- A. M. Rothschild & Company
- A. M. Wilson Company
- A. Mamaux & Son, Inc.
- A. N. Clark & Son
- A. N. Parry & Company
- A. Nacke & Son
- A. Nash Company
- A. Nelson Manufacturing Company
- A. O. Leonard
- A. O. Smith Company
- A. Overholt & Company
- A. P. Callahan & Company
- A. P. Dickey Manufacturing Company
- A. P. Fox Specialty Company
- A. P. Munning Company
- A. P. Smith Manufacturing Company
- A. P. W. Paper Company
- A. P. Witteman Company
- A. Petersen & Company
- A. Plamondon Manufacturing Company
- A. Quint
- A. R. Justice Company
- A. R. Mosler & Company
- A. R. Mullins
- A. Robbins Varnish Company
- A. Rosenberg Motor & Manufacturing Company
- A. S. Aloe Company
- A. S. Boyle Company
- A. S. Cameron Steam Pump Works
- A. S. Campbell Company
- A. S. Comstock
- A. S. Henn & Company
- A. S. Hinds Company
- A. S. Nichols & Company
- A. S. Noonan Tool & Machine Works
- A. Schoenhut Company
- A. Schrader's Son, Inc.
- A. Shaw & Son
- A. Stauder & Company
- A. Stein & Company
- A. T. Cross
- A. T. Ferrell & Company
- A. T. Stearns Lumber Company
- A. T. Taft Manufacturing Company
- A. T. Thompson & Company
- A. Theodore Abbott & Company
- A. V. Cleland
- A. V. Lindquist Company
- A. W. Black
- A. W. Burritt Company
- A. W. Cadman Manufacturing Company
- A. W. Chesterton Company
- A. W. Drake Manufacturing Company
- A. W. Gray & Sons
- A. W. Hall & Company
- A. W. Harris Oil Company
- A. W. Haydon Company
- A. W. Houchin
- A. W. Miller Manufacturing Company
- A. W. Rosen & Company
- A. W. Sainsbury, Ltd.
- A. W. Stevens Company
- A. W. Straub & Company
- A. W. Tedcastle & Company
- A. Weiskittel & Son Company
- A. Weiskopf
- A. Wulfing & Company
- A. Wyckoff & Son Company
- A. Y. McDonald & Morrison Manufacturing Company
- AB Separator
- AC Spark Plug Company
- AP Parts Corporation
- ARG Auxiliary Spring Company
- AT&T Technologies, Inc.
- Aaron Carlson, Inc.
- Aaron Electric Company
- Abart Gear & Machine Company
- Abbey & Imbrie
- Abbott & Company
- Abbott Ball Company
- Abbott Coin Counter Company
- Abbott Company
- Abbott Laboratories
- Abbott Motor Car Company
- Abbott Piano Action Company
- Abbott Worsted Company
- Abbury-Paine Manufacturing Company
- Abeeco Mill, Inc.
- Abel & Bach Company
- Abels & Company
- Abelsen & Scott
- Abenaque Machine Works
- Abendroth & Root Manufacturing Company
- Abendroth Brothers Corporation
- Abercrombie & Fitch Company
- Aberdeen Automobile Company
- Aberfoyle Manufacturing Company
- Abingdon Seat & Tank Manufacturing Company
- Abner Manufacturing Company
- Aborn Steel Company
- Abram Cox Stove Company
- Abrasive Machine Tool Company
- Abrasive Material Company
- Absorene Manufacturing Company
- Acason Motor Truck Company
- Accurate Engineering Company
- Accurate Metal Weather Strip Company
- Ace Amusement Company
- Acetylene Apparatus Manufacturing Company
- Acetylene Gas Illuminating Company
- Acetylene Lamp Company
- Acetylene Stove Company
- Acheson Colloids Corporation
- Acheson Harden Company
- Acheson Oildag Company
- Acieral Company of America
- Ackerman & Baird, Inc.
- Acklin Stamping Company
- Ackroyd & Best, Ltd.
- Acme Adder Manufacturing Company
- Acme Apparatus Company
- Acme Asbestos Covering & Flooring Company
- Acme Auto Appliance Company
- Acme Brass Works
- Acme Burlap Bag Company
- Acme Card System Company
- Acme Chain Corporation
- Acme Diamond Tool Company
- Acme Die-Casting Corporation
- Acme Electric Auto Works
- Acme Engine Company (MI)
- Acme Engine Company (WA)
- Acme Engineering Company
- Acme Equipment & Engineering Company
- Acme Fancy Wire Works
- Acme Foundry Company
- Acme Furnace Equipment Company
- Acme Gear Works, Inc.
- Acme Harvester Company
- Acme Harvesting Machine Company
- Acme Leather Company
- Acme Machine Company
- Acme Machine Tool Company
- Acme Machinery Company
- Acme Magneto & Electrical Company
- Acme Manufacturing Company (Allegheny, PA.)
- Acme Motor Car Company (NY)
- Acme Motor Car Company (PA)
- Acme Motor Truck Company
- Acme Road Machinery Company
- Acme Rubber Manufacturing Company
- Acme Shear Company
- Acme Stapling Machine Company
- Acme Steel & Malleable Iron Works
- Acme Steel Goods Company
- Acme Steering Device Company
- Acme Tank Company
- Acme Tire Machine Company
- Acme Torsion Spring Company
- Acme Universal Joint Manufacturing Company
- Acme Veneer & Lumber Company
- Acme White Lead & Color Works
- Acme Wire Company
- Acorn Brass Manufacturing Company
- Acorn Motor Car Company
- Acre-an-Hour Sifter Company
- Active Furniture Company
- Active Manufacturing Company
- Actus Products Corporation
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