Timeline for all types of items produced by
Psion

Year	Items
1981	2
1982	1
1983	1
1984	12
1985	3
1986	6
1987	2
1989	4
1991	5
1992	3
1993	4
1994	2
1995	4
1996	3
1997	3
1998	2
1999	1

58 items with a valid date were considered for this timeline (64.44% of the total)
32 items with an invalid date.

Help us in our quest to find exact dates for:

198?: 32 items.