Torrenscrew

hello all, just joined this page really for help and reference with some of the "stuff" ive found in my late grandfathers house and hoping some of you could help me out. did a bit of research on some of the items ive found 1, A machine gun camera type g.45 14a/1389 2,Tel sightg no39 mk 4 and another what looks like a tank commanders sight block or some sort of right angle periscope angle. Ill try and find the correct threads to post some pics up Thanks for reading Mick