Bob Parker wrote in message
...
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

manufacturer
JRC