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Question:

Who invented the hot water bag?

Who invented the hot water bag?

Answer:

Before the invention of this kind of soft hot water bag, people use metal, glass, ceramics, wood and so on to make the container on the bed.
The rubber we use now (or similar material) hot water bag do is Croatia Engineer Eduard Penkala (1871 - 1922) of the invention, he holds 80 patents, including the "mechanical pencil" (now the automatic pencil prototype), a solid ink pen (ball pen, the prototype now) a rail vehicle brake system, a battery anode and so on.
Croatia Engineer Eduard Penkala (1871 - 1922) invention. What kind of heating in China copper or tin oblate, who invented unable to research, but from the literature in Tang and Song Dynasties, there was.

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