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Old 07-10-2012, 07:45 AM
  #5  
nativetexan
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Join Date: Feb 2009
Location: home again, after 27 yrs!
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I've had a clear ruler like that for years. it has slits that you mark the center line in. the ends of the ruler are pointed to fit in the corners of the square. she didn' t " invent" anything.
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