933 is easy. It's a device for mountain climbers. It is wedged into rock cracks then pulled on, it automatically expands and grips so the climbing crazies can risk their lives believing it will hold them.
934 looks like a 'tome' device for making extremly thin slices, probably for tissues in a medical lab.
935, I forget the term, they are used to stop chasing cars or people by having a point up to puncture or hurt. Many are tossed out at a time.
The word I know for them is caltrops. They go way back in history - formerly used against horses.
936 looks like another kind of 'tome' slicer thingy.
937 music stand for Mutt and Jeff singing duo.
938 ice hook for pulling large blocks of ice.
I took this one to be a type of pickaroon used for wrangling pieces of wood in a mill.
939 an early high intensity spotlight or slide projector.
Looks like a spotlight to me. The slot would accept coloured pieces of glass and the focus knob would change the size of the spot