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But how many of you will be reminded of those great times by this selection of photos?
They show the Plessey sports day, factory visits and plenty more besides.
You will, of course, have your own memories of the workplace and the people who worked there.
So take a browse through our photo spread and get in touch if you have memories to share.
5. A general view
The Plessey factory in 1976. Did you work there and what are your memories of it? | JPIMedia Resell Photo: SE
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6. Paying a visit
Post Office telecommunications chief, K H Cadbury is pictured on a visit to Plessey where he is seen talking to Norma Douglas of Sunderland in 1972. | JPIMedia Resell Photo: Sunderland Echo
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7. Sports day fun
It's a close-run thing in the 1975 wheelbarrow race at the Plessey sports day. | JPIMedia Resell Photo: Sunderland Echo
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8. Another 1977 reminder
These Plessey workers were pictured after a union meeting in 1977. | JPIMedia Resell Photo: Sunderland Echo