Lettergraphics isn’t as famous as Photo-Lettering, ITC, Letraset, or VGC, but their wacky film fonts supplied a substantial amount of the display typography of the 1970s (see https://fontsinuse.com/sets/10268/lettergraphics).
We’re lucky to have their largest specimen catalog in our @FontsInUse library, but it’s been in storage for a while due to the awkward format. Finally broke it all out and posted some images: https://flickr.com/photos/23806189@N00/sets/72157696948996612