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| Sometimes the patent was stamped without any date code. See if there are any additional details that can help you figure out an approximate date [[#Triggers|'''here''']]. | | Sometimes the patent was stamped without any date code. See if there are any additional details that can help you figure out an approximate date [[#Triggers|'''here''']]. |
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| ====CANADIAN PATENT No. 197365/20====
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| <span style="color:#800000">['''1927 & 1928 up to 1934''']</span> The patent for Dunhill's aluminum [https://pipedia.org/images/3/32/Innerwflange.jpeg Inner Tubes with flange] registered in '''Canada'''.<br>
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| The date code is just after the patent number (sometimes after ENGLAND): '''1920 +: <span style="font-size:small"> <u>8</u>, <u>9</u> and, <u>0</u> for 1930, then <u>11</u>, <u>12</u>, <u>13</u> and, <u>14</u> for the early-30s.</span>''' (they are smaller and underscored).
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| * In 1927, this patent was applied without the "CANADIAN" before the patent number, i.e, only "PATENT. No. 197365/20"
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| * "MADE IN ENGLAND" stamped on pipes intended for export, in these cases, stamped '''DUNHILL'S "SHELL"''' (without "BRIAR").
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| Sometimes the patent was stamped without any date code. See if there are any additional details that can help you figure out an approximate date [[#Triggers|'''here''']].
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| <div class="separator" style="clear: both; text-align: center;"></div> | | <div class="separator" style="clear: both; text-align: center;"></div> |