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    Item ID number:
    5421129
    Date:
    31 October 1944 (21 December 1934)
    Source:
    Government
    Reference:
    R216, RG10-D-11-a, Volume number: 10992
    [Patent no. 23561, sale no. 129]. Title assigned by Library and Archives Canada. Patent granting Ahafia Ivanovna Chursinoff Ptn. of N 1/2, 
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