<https://www.americanroadmagazine.com/forum/topic/1933-building-the-illinois-national-road/#comment-17956>
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"Jim \n  \nNo, No, NO!!  Not necessarily 1925 or after!  It is logical to assume that the Caterpillar name / logo came into existence in 1925, but that is not the case. \n  \nThe Caterpillar trade mark was used by Holt in the teens, and I have seen the exact wavey CATERPILLAR trade mark in the photo on a 1921 model.in a photo on the web. And Holt had a plant in Illinois. And their 1920 manual uses the exact logo on its cover. \n  \nThe photos might be after 1925, but they just as well could be 1920 (or 1921, based on your map).  Unless the cars and truck are post 1920, I would suggest ca. 1920 and assert it was part of the major 1920 (or perhaps 1921) season upgrade. \n  \nDave \n  \nKeep the Show on the Road! \n"
<https://www.americanroadmagazine.com/forum/topic/1933-building-the-illinois-national-road/?tab=comments#comment-17947>