Chao cac ban.Theo dong chay cua thoi gian chung toi co hang tram co vat gom,su co nien dai tu the ky 11 den the ki 19,rat doc dao mang dam dau an lich su.Do la ket qua nghien cuu va suu tam hon 20 nam qua cua cua hang chung toi.Rat mong cac ban ung ho.