唐县
Tang county in Baoding 保定[Bao3 ding4], Hebei
膛线
rifling (helical grooves inside the barrel of a gun)
唐宪宗
Emperor Xianzong of Tang (778-820), reign name of twelfth Tang emperor Li Chun 李純|李纯[Li3 Chun2] reigned 805-820
汤显祖
Tang Xianzu (1550-1616), Ming poet and dramatist, author of The Peony Pavilion 牡丹亭[Mu3 dan5 Ting2]