I really really want to thank Stevan G for his amazing help and patience in teaching me about EI Nis. He's working on a forthcoming book about Serbian semiconductors and I hope you can all enjoy it when it's out.

Additional Notes:
Zavodi doesn't mean "lab" in this context, it's more like "institute"
Belind did not produce diodes commercially. They were more a developmental institute rather than a factory enterprise

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