Thunder crash bomb
From Infogalactic: the planetary knowledge core
(Redirected from Zhen Tian Lei)
The thunder crash bomb (Chinese: 震天雷; pinyin: zhèntiānléi) is an early type of bomb or hand grenade developed in 10th century China. Its shell was made of cast iron and filled with gunpowder. The length of the fuse could be adjusted according to the intended throwing distance.
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