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    Item ID number:
    5421912
    Date:
    16 May 1951 (29 September 1947)
    Source:
    Government
    Reference:
    R216, RG10-D-11-a, Volume number: 10996
    [Patent no. 24469, sale no. 111]. Title assigned by Library and Archives Canada. Patent granting John Johnson and George De Smit and William De Smit 
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