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* The date code is just after the patent number: 1920 +: <span style="font-size:small"><u>2</u>, <u>3</u>, <u>4</u>, <u>5</u> or <u>6</u></span> (they are smaller and underlined). | * The date code is just after the patent number: 1920 +: <span style="font-size:small"><u>2</u>, <u>3</u>, <u>4</u>, <u>5</u> or <u>6</u></span> (they are smaller and underlined). | ||
* If it has the patent number but doesn't have the date code, it is (possibly) from before 1921. If that's your case, | * If it has the patent number but doesn't have the date code, it is (possibly) from before 1921. If that's your case, [[#Pre-Date-System| '''Click Here''']]. | ||
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