This is the first version of a Bridgeport power feed. Notice the separate control box. The motor gear box is separate from the control box. The circuit board mounted in the control box.

Similar to A, except the circuit board and control box are all mounted to the gear box. It’s all one piece. Notice the word Bridgeport on the gear box cover. 6f upgrade conversion kit is applicable to this unit. The conversion kit is an upgraded circuit board.

8f is the latest unit and design style for the Bridgeport power feed. Notice the lack of the word Bridgeport on the front cover of the gear box.