Welcome to AAPK. Most if not all of those are likely from the 1950s, have celluloid handle covers, and were among the least expensive brands offered by the makers. One of the greatest features of this site is the ”search” function which can be found to the upper left above this post, under the “Quick links” heading. Just click on Quick links, scroll down to “Search”, and click on that. Then type the name stamped on the tang of the knife into the search field and press submit. In most cases you’ll get back many posts containing info about the knife. FYI the first knife you posted, which is difficult to read has the “Hammer Brand” stamp.
Most of those you’ve pictured are brand names for which the info you’ve requested can be found readily through search.

You may even find examples of the same exact knife as yours. For example a search for CAMCO found this post (among others)
viewtopic.php?f=35&t=8307&hilit=Camco#p69354
Ken