§  1.357   Mechanical reproductions as evidence.

   Unless offered for the sole purpose of attempting to prove or
   demonstrate sound effect, mechanical or physical reproductions of sound
   waves shall not be admitted in evidence. Any party desiring to offer
   any matter alleged to be contained therein or thereupon shall have such
   matter typewritten on paper of the size prescribed by §  1.49, and the
   same shall be identified and offered in duplicate in the same manner as
   other exhibits.

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