Someone said that the calendar is for 1942, 1953 or 2009, right? Since this probably is going on in 1945, I think it must be 1942. Thi can mean that the workers or the people workibg there left the factory in Sept. 1942. I alI also agree that thursday might have been a "testing-day" because of the notes on the calendar. Or maybe there was some real happenings on those dates?