When did Zacherl Coal Company go bankrupt?
They didn't go bankrupt, the company simply dissolved with new EPA restrictions in the 1970's.
If the Bankrupt company is just the retailer then the warranty is still covered by the manufacturer. If the manufacturer goes bankrupt then the retailer covers the warranty. The seller is responsible for a warranty. Clearly if the seller is the manufacturer and they go bankrupt then it's most unlikely that the warranty will remain in force.
if the company goes bankrupt or if the whole stock as a whole crashes then you would lose all your money or alot of it but if the single company is good in time you will get your money bank as long as the company didnt go bankrupt 1 stock company is very good if its a good company because its easy to manage it and learn about the ups and downs of it