Kodak Plates.

My father used to develop all his photographs, I was occasionally allowed to help him.
This is the top of an old box of 3 1/4 x 3 1/4 inch Kodak Plates. Inside there are three undeveloped images taken by him of my mother's parents, his mother and sister.
I found them when I inherited the desk from his study. Not sure how to get them processed, but there must be a way.