7 Up was created by Charles Leiper Grigg, who launched his St.
Louis–based company The Howdy Corporation in 1920. Grigg
came up with the formula for a lemon-lime soft drink in 1929.

The product, originally named "Bib-Label Lithiated Lemon-Lime
Soda", was launched two weeks before the Wall Street Crash of
1929. It contained lithium citrate, a mood-stabilizing drug, until
1948. It was one of a number of patent medicine products popular
in the late-19th and early-20th centuries. Its name was later
shortened to "7 Up Lithiated Lemon Soda" before being further shortened to just "7 Up" by 1936.

Charles Leiper Grigg
(May 11, 1868 – April 16, 1940)       
      
      
      
     
Glass bottle with paper label (1930’s)

Royal Crown Cola is a brand of cola invented by pharmacist Claud
A. Hatcher of Columbus, Georgia in 1905 and was originally created
for Cole-Hampton-Hatcher Grocery Store as an early generic brand,
to avoid the high cost of purchasing Coca-Cola syrup.

RC Cola is owned and distributed in the U.S. by Keurig Dr Pepper.
In the rest of the world, it is distributed by RC Cola International.

Claud Adkins Hatcher
(August 20, 1876 – December 31, 1933)

^]Diet Rite is a brand of no-calorie soft drinks that was originally distributed by the RC Cola company..

Diet Rite was introduced in 1958 and initially released as a dietetic product, but was introduced nationwide and marketed to the
general public as a healthful beverage in 1962.

7up, circa 1950s