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    Item ID number:
    5421744
    Date:
    19 April 1949 (17 November 1936)
    Source:
    Government
    Reference:
    R216, RG10-D-11-a, Volume number: 10996
    [Patent number 24283, sale numbers 138 and 139]. Title assigned by Library and Archives Canada. Patent granting Donald F. Ross and Harry V
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