Interesting to see how times have changed. I wonder if people had boundless optimism about these companies back then too:

Also, here are the companies in the Dow in September of 1929:
September 14, 1929
Allied Chemical and Dye Corporation 	
General Foods Corporation †
Paramount Publix Corporation
American Can Company 	
General Motors Corporation 	
Radio Corporation of America
American Smelting & Refining Company 	
General Railway Signal Company 	
Sears Roebuck & Company
The American Sugar Refining Company 	
B.F. Goodrich Corporation 	
Standard Oil Co. of New Jersey
American Tobacco Company (B shares) 	
International Harvester Company 	
The Texas Company
Atlantic Refining Company 	
International Nickel Company, Ltd. 	
Texas Gulf Sulphur Company
Bethlehem Steel Corporation 	
Mack Trucks, Inc. 	
Union Carbide Corporation
Chrysler Corporation 	
Nash Motors Company 	
United States Steel Corporation
Curtiss-Wright Corporation †
National Cash Register Company 	
Westinghouse Electric Corporation
General Electric Company 	
North American Company 	
F. W. Woolworth Company            
Comments
Adding - some are immediately recognizable but I haven't a clue with others.
Honeywell
Kraft Heinz
ViacomCBS
Citigroup
GM
GE/Comcast
Grupo México
Alstom
Transformco
Florida Crystals Corporation
Goodrich Corporation/Michelin
ExxonMobil
British American Tobacco PLC
Navistar International
Chevron
BP
Inco LTD
Elf Aquitane
Liquidated
AB Volvo
Dow Chemical
Stellantis
Stellantis
U.S. Steel
Curtiss-Wright Corporation
NCR Corporation
ViacomCBS/Westinghouse Electric Company
GE
Various Utility Companies
Foot Locker