Most of the ones you show are AMG ( Allied Military Government ) The others are regular cancels. None are precancels as far as I can tell See this recent post: http://goscf.com/t/38113&whichpage=2#646088
Another opinion ... the upper right stamp looks like it has the smallest bit of wavy-line machine cancel across the top edge, and then got a few scribble strokes with an indelible pencil by a postal worker who saw it and thought it needed more obliteration.
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