Sorry for the corrections, but many of the things that are said in this group are repeated on eBay and on websites, so we always try to be accurate. Barovier & Toso did not come into being until 1936. The Barovier company in existence during the time given would be Artisti Barovier. The Barovier brothers bought the company from Salviati and worked with them, making glass designs. I have a hard time separating the work of Salviati and Barovier during this time. I have seen a couple of designs that were claimed by both companies. I suspect they were made by Barovier for Salviati and for themselves.
According to Gable in Murano Magic, Barovier & Toso had a separate development pathway coming down from Francesco Ferro & Figlio (1880-1901). Barovier didn't enter the name of the company until 1936 when Ercole joined the firm.