Once, when I showed this window frame from Kovrov, a person I was talking to has noted the frame had had four of these lugs and there were protruding parts in the middle. It is very probable as the edge of the frame is uneven and most of frames in the Vladimir Oblast in general and in the Kovrov in particular are rather well-balanced.
I tried to object then, as this one seems rather good, but every time I look at it keep thinking that person might be right
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