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Date: 1921
Co-Lab contributions: No
Hierarchical level: Item (linked)
Available online: No
Source: Government
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    Item (linked)
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    Item ID number:
    5417691
    Date:
    19 April 1921 (14 June 1911)
    Source:
    Government
    Reference:
    R216, RG10-D-11-a, Volume number: 10971
    [Patent number 19551, sale numbers 270 and 271]. Title assigned by Library and Archives Canada. Patent granting Archibald H. Spurr, Norman Eby Weddle and 
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