They're interesting aren't they? I'm a youngin' both in the world of photography and the real word so I don't recognize that stuff at all. He's giving them to me so if no one knows I'll find out when I get them soon enough... just seeing if any of the experts here have a good eye.
There were quite a few similar to the forst from a handful of manufacturers in UK/Europe. There will be makers names on all of them as well as on the lenses/shutters.
The camera in the middle looks like a Haneel Tri-Vision 3-D camera made in California around 1953. Plastic and aluminum. The one on the left looks to me that it might be a hand-made, or modified camera. And on the right, a fairly typical folder of the 30s to 50s era.
the one in the middle looks like
a movie camera ...
2 lenses swing / bayonet mount
the thing in the middle between the lenses is a shutter speed dial
if you have the camera handy can you read what the lenses say ?
if my memory is right, a wide angle 8mm lens is 12.5mm and a normal is 24mm and a tele is around 36mm
some don't have separate fstop rings and they focus by changing the fstop
( there are distances and fnumbers sort of next to eachother )
if there are any numbers on the edges of the center dial ..
film cameras have the usual b-t-5-10-25-50-100 ( or a variation of that )
movie cameras have something like 12-16-18-24-32-48-64 ( or something similar )
The one on the right looks like an Agfa Isolette, the wooden one looks like a Tropical Version of the Goerz Anschütz Ango or a Zeiss Ikon Nettel Deckrullo which usually has different struts, the struts are more like the Ango.