That Corporation 1200 , 1203 , 1206 circuits

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Anyone know of any real world applications of this opamp?
Id like to design an line receiver / input buffer circuit around this chip.

After reading all the documentation and forums, i still have 2 questions.

From input to output, does this chip invert signal?

How could a variable gain option be added to the THAT 1200 basic circuit?

Thanks in advance
 
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