Products
- Greensburgh and Hempfield Electric Street Railway Company
- Greenville & Columbia Rail Road Company
- Greenwich Village Playhouse, Inc. (Signed by Kenneth Macgowan)
- Greyhound Corporation
- Greyhound Corporation
- Grigsby-Grunow Company (Majestic Radios)
- Grizzly Bear Mining Company
- Grizzly Gold Mining Company
- Grouse Mountain Highway and Scenic Resort Limited
- Grumman Corporation
- Gruntal Financial Corp.
- GTE Corporation
- GTECH Holdings Corporation (Lottery)
- Guanajuato Amalgamated Gold Mines Co.
- Guardian Detroit Union Group, Inc.
- Guerrero Mines Company
- Gulf Colorado & Santa Fe Railway Company
- Gulf Oil Corporation
- Gulf States Utilities Company
- Gulf, Mobile and Northern Railroad Company
- Gulf, Mobile and Ohio Railroad Company
- Gulf, Mobile and Ohio Railroad Company
- Gulfport and Mississippi Coast Traction Company
- Gulfport and Mississippi Coast Traction Company
- Gurleys & Paint Rock Valley Railway Company
- Gyro Air Lines, Inc.
- H. J. Heinz Company
- H. J. Heinz Company
- H. M. Byllesby and Company
- H. R. Weissberg Corporation
- Hachenberg Turbine Company (Flushing, New York)
- Hackettstown National Bank
- Hagerstown Base Ball Association, Inc. (Hubs)
- HAL, Inc. (Hawaiian Airlines)
- Halliburton Company
- Hambleton & Company
- Hamilton Watch Company
- Hamilton Watch Company
- Hamilton Watch Company
- Hannibal and St. Joseph Rail Road Company
- Happy Thought and Fairview Mining Company (Patagonia District)
- Harbor State Bank
- Harlem & Spuyten Duyvil Navigation Co.
- Harlem River and Portchester Railroad Company (Signed William Waldorf Astor and Franklin Hughes Delano)
- Harley-Davidson, Inc.
- Harnischfeger Corporation
- Harrisburg Railways Company
- Harrisburg Railways Company
- Harrisburg Steel Corporation
- Harrisburg Traction Co.
- Harrisburg, Portsmouth, Mount Joy and Lancaster Rail Road Company
- Hartford and Connecticut Valley Railroad Company
- Hartford and Connecticut Valley Railroad Company
- Hartford and Connecticut Western Railroad Company
- Hartford and New Haven Rail Road Company
- Hartford and New Haven Rail Road Company
- Hartford and New Haven Rail Road Company
- Hartford and New Haven Railroad Company
- Hartford Golf Club Company
- Hartford Steam Boiler Inspection Insurance Company
- Hartford, Providence and Fishkill Railroad Company
- Hartman Corporation
- Harvey Rim & Wheel Co., Inc.
- Haskell Mining Company (Death Valley, California)
- Haskell Mining Company (Death Valley, California)
- Haskell Mining Company (Death Valley, California)
- Hat Corporation of America
- Hawaii, State of
- Hawaiian Canneries Company, Ltd.
- Hazard Wharf Company of Baltimore City
- Hazel-Goldfield Mines Company
- Hebrew National Kosher Foods, Inc.
- Heck's Inc.
- Hedley Gold Mining Company Limited
- Heilig-Meyers Company
- Heilig-Meyers Company
- Helemano Company, Limited (Hawaii)
- Helena Electric Railway Company
- Helena Motor Railway Company
- Helvetia Copper Company
- Henderson Belt Railroad Company (Kentucky)
- Hercules Motors Corporation
- Hereford Railway Company
- Hermann Mining Company of New York
- Herold Radio & Electronics Corporation
- Hershey Chocolate Corporation
- Hershey Foods Corporation
- Hertz Corporation
- Hestonville, Mantua and Fairmount Passenger Rail Road Company
- Hestonville, Mantua and Fairmount Passenger Railroad Company
- Hidden Fortune Gold Mining Company
- Hidden Fortune Gold Mining Company
- Highland Gold Mines Company
- Highland Park and Fruit Vale Railroad
- Highland Valley Power Company
- Hill Top Metals Mining Company
- Hiller Aircraft Corporation
- Hiller Helicopters
- Hilton Hotels Corporation
- Hiteman Leather Company, Incorporated