Antique Photo Factory Workshop Man & Woman Workers Barrels Boxes Early 1900s

This is an antique photo of two people, a man & woman, in some kind of workshop.   No one wrote anything on this picture to identify the people or its age - we believe it is very early 20th century.  It is mounted on a larger cardboard backing & is a little faded.

There is some sort of light above the table, but I'm not convinced that it is electric.  The items on the floor near a table and a barrel look like nuts & bolts to me, but it could be anything.  It has an ornate, probably tin, ceiling.

I've gone over this picture with a magnifying glass looking for anything like tools or advertising I could identify.  Some of the items on the shelves have writing, but I could not read it.

I like pictures like this because of all the details in it - details no one gave a thought about.  This one is full of wooden barrels, boxes, shelves with cans on them, stuff piled on the floor, and on and on.  I have no idea what kind of work went on there, but it captures a fraction of a second of two people's lives.  Two people who are long gone, but who look quite healthy here.

Update:  Sold!