I want to know the answer to the following question:
When was the double indirect method invented?
All the background I'm provided with is that "This method was created in 1989 by Maurizio Placuzzi and registered for industrial use (patent n. 0000222556) under the name of his company, Sicis International Srl, now Sicis The Art Mosaic Factory Srl.". Is that enough to answer the question?