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    Item ID number:
    5417877
    Date:
    21 January 1922 (12 May 1903)
    Source:
    Government
    Reference:
    R216, RG10-D-11-a, Volume number: 10973
    [Patent number 19775, sale numbers 34 and 35]. Title assigned by Library and Archives Canada. Patent granting Frederick James Walker and James EP 
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