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<span style="color:#800000">['''1921 up to 1927 then 1927 up to 1933 & WWII Period''']</span> The patent for Dunhill's Oil Treatment/Sandblasting, registered in '''United States'''.<br> | <span style="color:#800000">['''1921 up to 1927 then 1927 up to 1933 & WWII Period''']</span> The patent for Dunhill's Oil Treatment/Sandblasting, registered in '''United States'''.<br> | ||
The date code is just after the patent number (sometimes after ENGLAND): '''1920 +: <span style="font-size:small"><u>2</u>, <u>3</u>, <u>4</u>, <u>5</u>, <u>6</u>, <u>7</u>, <u>8</u> and <u>9</u></span>''' (they are smaller and underscored). | The date code is just after the patent number (sometimes after ENGLAND): '''1920 +: <span style="font-size:small"><u>2</u>, <u>3</u>, <u>4</u>, <u>5</u>, <u>6</u>, <u>7</u>, <u>8</u> and <u>9</u>, then <u>0</u>, <u>11</u>, <u>12</u> and, <u>13</u> for the early-30s.</span>''' (they are smaller and underscored). | ||
* From ''''27 up to '29''' the patent number was preceded by '''"U.S.PATENT"'''. | * From ''''27 up to '29''' the patent number was preceded by '''"U.S.PATENT"'''. |