原文:
"Here is a selection of "Superite" pencils, none of which bear the De Witt-La France name... De Witt and La France applied for 2 separate patents for their pencil designs on October 2, 1919, which were granted on July 25, 1922 as number 1,423,603 and on November 22, 1922 as number 1,434,684.
That means the pencils with Pat. Pend on both the clip and the pencil were made between 1919 and 1920; the ones that say Pat. Pend. on the pencil but Pat. on the clip were made between 1920 and 1922."