Abrams Intervalometer Type B-7. Aerial Camera Control Unit for Bomber Aircraft For Sale

Abrams Intervalometer. Type B-7. Made by Abrams Instrument Co. Lansing Michigan for the US Army Air Force. I believe that it is an unused unit. Dimensions are 6 1/2\" by 5\" by 3 1/2 \".Includes one connector cable. Serial Number 43-38540. It was still sealed in a soft packaging when I got it. ( original packaging included ) I opened it to take inspect it and take pictures. The packaging looks original, so I doubt that it was a unit that was used and re sealed in this packaging. The knob works and the other buttons seem to work, but I don\'t know if the unit is functional. The unit was apparently designed to control aerial photographic cameras in bombardment aircraft.It is a collector quality piece of history. Please rely on photos for further details.