Which of Hero's known works documents his numerous inventions, including the dispenser?
Answer
Pneumatica
Although the specific design of the water dispenser represents an isolated instance of transactional automation, the breadth of Hero's engineering concepts and documented inventions are preserved in his writings. The text indicates that this specific water dispenser is one of the dozens of inventions documented within Hero's work titled Pneumatica. This source establishes the theoretical groundwork of his mechanical prowess, even if the concept of automated retail did not immediately inspire a widespread industry following its publication.

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