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Pipedia Dunhill Dating Guide: Difference between revisions
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====1341418/20==== | ====1341418/20==== | ||
<span style="color:#800000">['''1921 up to 1927 & 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 1929 & 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> and <u> | 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). | ||
* From ''''27 up to '29''' the patent number was preceded by '''"U.S.PATENT"'''. | |||
* Loring defends a hypothesis that this patent was also applied in the WWII period without date code or any other nomenclature, like the inner tube, for example. See more about it [[WWII Phase|here]]. | * Loring defends a hypothesis that this patent was also applied in the WWII period without date code or any other nomenclature, like the inner tube, for example. See more about it [[WWII Phase|here]]. | ||