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    Item ID number:
    5421410
    Date:
    30 August 1946 (25 July 1946)
    Source:
    Government
    Reference:
    R216, RG10-D-11-a, Volume number: 10994
    [Patent no. 23902, sale no. 219]. Title assigned by Library and Archives Canada. Patent granting Helen Elizabeth Coram and Ethelyn Audrie Grabham lot 12 
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