Mr André Duchossoir passed away November 17th 2020. He was a worldwide expert and collector of the first generation. Many can say much more than me about him. I contacted him some times to ask advices about vintage player Tellies I was restoring and he always answered very rigorously. A huge sum of knowledge about american instruments history is gone.Hopefully he has writen a lot. Rest In Peace Mr Duchossoir and much respect to you.