Timeline for all types of items produced by
Shoken [Showa Giken]

Year	Items
1987	1
1991	2
1994	2
2003	1
2005	2
2006	1
2007	4
2009	2
2010	3

18 items with a valid date were considered for this timeline (72.00% of the total)
7 items with an invalid date.

Help us in our quest to find exact dates for:

19??: 2 items.
????: 5 items.