Patent for a 1932 device that injects ice-cream into bananas -- BBG
On BBG, our Lisa's found the patent application for a 1932 invention that injected ice-cream into bananas. The device was never productized, but I believe at least one working model must have been made to accompany the patent application (working models were a requirement for patenting until recently).
1932 banana-ice cream injector patent
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