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History of the manufacturer  

Ajax Electric Specialty Co.; Saint Louis, Missouri

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Name: Ajax Electric Specialty Co.; Saint Louis, Missouri    (USA)  
Abbreviation: ajax
Products: Model types

Ajax Electric Specialty Company
1926 Chestnut Street 
Saint Louis, Missouri

In the 1918 incorporation documents the company was located at 1408 Morgan Street in Saint Louis. 
Ernst Alschuler was listed as President.

Trade Name: Marveltone

Founded: 1918
In the November 1924 The Radio Trade Directory under the heading manufacturers of Vacuum Tube Sets on page 82, and in the November 1925 edition of The Radio Trade Directory on page 127 the Ajax Electric Specialty Company was located at 1926 Chestnut Street in Saint Louis, Missouri. 
The company was no longer listed in the August 1926 edition of the McGraw-Hill Radio Trade Catalog. 

Some models:
Country Year Name 1st Tube Notes
USA  25 ACS Crystal   One dial (primary tuning control knob) 
USA  24/25 Crystal [old]    
USA  26 Crystal [new]    
USA  25 Ajax Junior Crystal   Loose coupler crystal set with slide tuning.  
USA  25 Marveltone [old]   Three dials (primary tuning control knobs) 
USA  26 Marveltone [new]   Three dials (primary tuning control knobs) 


Further details for this manufacturer by the members (rmfiorg):

August 17, 1918 Electrical Review magazine page 273tbn_usa_ajax_electric_august_1918_electrical_review_273.jpg