Pool for Apex Electric, Chicago; United States Radio & Television Corporation; Marion, Indiana (~1930).
- Trade names Apex, Argyle, Carlton, Case, Gloritone, Mantola, Melrose, Radiotrope.
"US Radio & Refrigeration" is an error found in Stein: "M-a-c-h-i-n-e  A-g-e  to  J-e-t  A-g-e" (EE: with - for avoiding to be in search result), Vol.2, p.308/309. The Index in Vol.1 is correct.

In the November 1925 edition of The Radio Trade Directory on page 121, under the listing for manufacturers of Knockdown kit sets, the Apex Electric Manufacturing Company was located at 1410 West 59th Street in Chicago, Illinois

U.S. Radio & Television Corp.; - Trade names Apex, Argyle, Carlton, Case, Gloritone, Mantola, Melrose, Radiotrope - was merged to "General Household Utilities Company in late 1933: In the September 1933 issue of "Radio Retailing" the merger is announced on page 32: "U.S. Radio and Television" and "Grunow Corporation of Chicago" have merged to "General Household Utilities Company". This according to the president of the new company, William C. Grunow. Mr. Coit is chairman of the board, vice-presidents are H.C. Bonfig and A.C. Winnan. J.P. Rogers is treasurer and R.R. Trimarco secretary.