OK lets have a crack on the Seguso backgrounds, the following is how I understand it historically, but I do stand to be corrected.
The historic origins of Seguso Vetri d'Arte go back to 1933 and a company called Artistica Vetraria e Soffieria Barovier Seguso e Ferro which was founded by Napoleone Barovier, Luigi Ferro, Antonio Seguso and his 3 sons, Archimede, Alberto and Ernesto. The first master glass blower for the company was Archimede Seguso. From 1934-1963 Flavio Poli served as the firms artistic director. Luigo Ferro left the firm I believe in 1937 and it is from this date that the Seguso Vetri d'Arte name came into being until the company closed in 1973. It then under went a couple of changes in ownership before re establishing the Seguso Vetri d'Arte name in 1978 until it's final sale to Cenedese in 1992.
Archimede Seguso left S V d'A in 1942 and established his own firm after the war in 1945 with Andrea Barbini, and in 1947 it was called Vetreria Archimede Seguso, and this was the vehicle for his work with others right through until his death.
I have loads more info on both but I hope that answers at least some of the basic questions.