These are parts from a 30 year old set of mirrored bifold doors. The only writing I find is Kilian Toronto Canada syracuse New York.
The spring at the top of pic is placed on the bottom of the door to hold the doors open. The second item is a pivot pin placed at the top and bottom corners on each out side corner of the doors. The next item is glider to hold the door in the top track. The last item below the ruler is the bottom track roller and is a bit bent and not longer will fit in the sleeve the holds it in the bottom of the door.
