Assertion: gunpowder | /r/CapableOf | have appeared in 1044 a.d.
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Source sentences:
text: According to the introduction to the 1999 edition of Partington by Bert Hall, "Gunpowder proper seems to have first appeared in 1044 A.D. in China, and to have worked its way westward over the next three centuries by routes still uncertain," referring to the 1044 "Collection of the Most Important Military Techniques" which includes three recipes for "gunpowder proper.