Pen Huo Qi
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The Pen Huo Qi is a double-piston pump naphtha flamethrower used in 919 in China, during the Five Dynasties and Ten Kingdoms period. The flamethrower was carefully documented and illustrated in the Chinese military manual known as the Wujing Zongyao, compiled in the year 1044 AD during the Song Dynasty. Among various descriptions of equipment and components of the device, the book also provided instructions for how to keep up maintenance and repair of double-piston flamethrowers.