I think that's taking semantic pedantry to the limit. "Similar things" would include similar to any of those previously mentioned.
The storage capacity of a pen is very unlikely to have any impact upon the style of the signature, and "the way it is held, particularly the angle" is a obvious difference in the writer's penmanship, not an explanation for one.
Didn't she conclude that the 3 signatures on the statement didn't match eachother too.
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