Changing box for 4 x 5 inch plates. Twelve plates carried in lockable light box. Transferred to single plateholder through light trapped slot opened automatically when the plateholder is attached. Light trapped on plateholder opened and closed by sliding lever. George Hare. Hare's patent automatic changing box
Bag plate changer for 2 1/4 x 3 1/4 inch plates. In twelve metal sheaths. No. 201. Bag type plate changer
