This email has been received from Kate Hewetson:-
I’m trying to research some symbols that are on the side of a Wooden WW2 Flight Box that contained electronic equipment and belonged to a Group Captain G H Burgess and was hoping someone in the Marconi Veterans may be able to help.
There are 3 metal plaques on the side of the box. One has Red Circles. One has Green Circles and the other has a faded sticker labelled " Maker - Marconi Company Ltd Basildon”.
I wondered if anybody knew the significance of these plaques please?