In March 1962, two different articles highlighted the introduction of the Jeep line of Tonka Toys.
1. Toys and Novelties Magazine: The article in this magazine noted that part of the reason the Tonka company had the financial and physical capacity to produce a wide variety of toy jeeps was that it had recently gone public.
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2. Playthings Magazine: Given this article is very similar to the top article, I’d guess both were written from press releases.
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You can also learn more about Tonka jeeps at the CJ-3B Page.