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    Item ID number:
    5405978
    Date:
    3 August 1917 (23 August 1912)
    Source:
    Government
    Reference:
    R216, RG10-D-11-a, Volume number: 10966
    [Patent no. 17961, sale no. 542]. Lansdowne (Ont.) Title assigned by Library and Archives Canada. Patent granting William Cowan and Norman Henry Stevenson 
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