>Thanks for the info! The IC's are being used in a mid 1970 Induction
>melting furnace and the pins have started to show signs of corrosion.
>Surprisingly the unit is in operation and works flawlessly!!
>Miracles of German engineering?

Would not surprise me. While serving my apprenticeship during the early 70's
I worked for a while in the company's marine service department. One of the
products was a HF marine radio that had a valve transmitter, having been
designed before 100W transistor transmittoers were a viable product, and so
it had a DC convertor which used a pair of 2N174 germanium transistors.
Continual exposure to the salt air on the local fishing boats caused the
cases of these transistors to erode away, exposing the die inside. The
transistor generally kept on working, but we replaced them whenever we found
them like this. Wish I had kept one of the ones we removed as a souvenir.

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