First two are Pearson Deadheads. They were made in two sizes. These look like the smaller, i.e., 1 38 inches wide. Actually, looks like you may have one of each. The lower looks to be the 1 1/2-inch wide version. Very good heads. The multi-blade head is a Wasp. I had some 4-blades of the same type back in the 70s or early 80s I believe. The blades broke off very easily. Pretty much junk, IMO. The last is a Bear razorhead. Lots of different versions. Don't know which you have.