Timeline for all types of items produced by
Simpson Co., R.D. [Columbus, OH, USA]

Year	Items
1915	1
1923	1
1927	1
1929	2
1930	1
1931	1
1935	1
1940	1
1941	3

12 items with a valid date were considered for this timeline (80.00% of the total)
3 items with an invalid date.

Help us in our quest to find exact dates for:

192?: 2 items.
194?: 1 item.