This beer can gallery includes collections and individual cans I have purchased over the years.
You'll notice different can types, including:

Cone Tops - The cone top can features a spout which also came with a bottle cap. They were produced from 1935 - 1960.
 

Crowntainer - This style is similar to the cone top and was produced for a few short years, 1945- Mid 50's

Flat Top - This type of can was produced from 1935 - late '60s. The opener used was called a church key which usually put one or two holes in the top of the can to enjoy the contents. These are commonly found in attics, crawl spaces, inside of the walls of buildings getting remodeled or torn down barns, etc.

Pull Tops and Zip Tops -- This type of can was produced from 1962 - 70's.