I don't know. Why don't you list the ones you DO remember, then go
here http://www.tvhistory.tv/1950-59-ALL-USA.htm to fill in the
blanks? FYI: They list 104 TV manufacturers for the years 1950-1959,
running from A (Admiral) to Z (Zenith).

Thanks for the ref. At least 20% of the names were unfamiliar.

The most-interesting was "Natalie Kalmus", the woman whose name appears as
"Technicolor consultant" on pre-1950 films. She was the once-wife of Herbert
Kalmus, the principal developer of Technicolor.