Timeline for all types of items produced by
Mankai Seisakujo

Year	Items
1988	8
1989	12
1990	12
1991	14
1992	13
1993	13
1994	12
1995	13
1996	11
1997	12
1998	12
1999	13

145 items with a valid date were considered for this timeline (100.00% of the total)