IBM All models that released under this brand

My devices

All IBM models by years

In 2001 — 2 devices 
WorkPad c500
IBM
2001-10-01
WorkPad c500
WorkPad c505
IBM
2001-10-01
WorkPad c505

In 2000 — only one device 
In 1999 — 3 devices 
In 1998 — only one device 
In 1997 — 2 devices