Can you tell us what brand the 4558s are? Often the manufacturers'
datasheets tell how to interpret the date codes.
I've recently bought SMD op-amps and DIP microcontroller chips with
'96' date codes, so they can sit around in storage for long periods.

Bob



On Mon, 29 May 2006 20:48:48 +0100, "n cook"
wrote:

4558s have been around a long time but I imagine the Just In Time /
accountancy wallahs would have something to say about componentry sitting on
shelves for a decade