#power_of_attorney  a legal instrument authorizing someone to act as the grantor's agent
  supertype:  #legal_document__legaldocument__legal_instrument__legalinstrument__officialdocument__instrument  a document that states some contractual relationship or grants some right
  subtype:  #stock_power__stockpower  a power of attorney document to transfer ownership of a registered security from the owner to another party
  subtype:  #proxy  a power of attorney document given by shareholders of a corporation authorizing a specific vote on their behalf at a corporate meeting

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