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			I have to agree with Jens. 
 Nothing in common, except  for the use  of words with a Sanskrit  root " kut, kat" relating to cutting, slashing, slicing etc.     Omani Kattara, a long-bladed weapon, having nothing in common technically with either of the daggers discussed here, is sharing the same root with them. A Roma  word kat means scissors: and Gypsies stem from India.
 
 I think we are not talking about anything structural, engineering etc: I think it is just philology.
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