They are the ancestors of Madame CARIOU, sacristans at Plozévet who made the hosts for religious ceremonies. Personally, I remember that in Bodilis it was Pierre who was working.
To do this, he opened doors and windows which made that the whole town was impregnated with the odor of cooking of the hosts. These were cut following the dotted line drawn by the pins inside the device. We, the children did not lose anything to wait because the falls of cuts were reserved for us.