What does the following list of companies have in common?

A&P
Hudson Motor Car Co.
Montgomery Ward
TWA
Horn and Hardart
Studebaker
Indian Motorcycle
Bonwit Teller
Woolworth
Bethlehem Steel
Polaroid
LTV

These Companies were successful, recognizable brands in their respective categories. They were publicly traded and a number were in the Nifty Fifty in the 1970