EverReady and Gem Razors
From left to right:
EverReady 1912
EverReady 1924
Gem Micromatic Open Comb (1930)
Gem Micromatic Clog Pruf (1940)
Gem Micromatic Bullet Tip (1947)
The EverReady/Gem family uses a single edge blade. The head should be almost flat to the face when shaving.
Wet Shaving Journal 
Is that second from the left also known as a shovel head?
Yes, a shovel head or a 24 (patent date). I will be shaving with this one tomorrow.