Hi Bernard,
the attributions in this book are unfortunately somewhat flimsy. Not that many actual manufacturers of the glass epergnes illustrated (bar Fenton, Steuben, & Webb's Burmese to name a few) are named.
There are also a couple of later repros (of the sort illustrated in that well-known 1920s Haden Mullet & Haden advertisement, & also a 20th c. Murano repro of a piece with applied flowers) attributed as Victorian & Stourbridge.
However, it is certainly a handsome book. Very high on the eye candy factor. And certainly rather nice to see the epergnes in use amongst the very sumptuous surroundings of their wealthy collector's home.
There is a opening chapter that deals with a general history of the epergne's development, from the early ship-shaped silver "nef" to the more familiar Victorian confections.
Nonetheless, it is more coffee-table book than a strictly scholarly tome.