I have some products in a table along with a column that has the data entry date (mm/yy). I need a formula that will tell me the first time the product was logged into the table.

Table example:

C618P7 Aug-12
C63036 Sep-14
E80129 Oct-10
C618P7 Oct-14

I need the formula to tell me that Aug-12 was the first time C618P7 was entered into database. Same goes for each item on the list.

Thx